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Showing posts with label astronomy. Show all posts

Monday, October 10, 2011 ~ Have your say...

Seeing the Earth from space during a solar eclipse

What would the Earth look like from space during a solar eclipse?  I wondered the same, and came across two incredible images.  Note that the moon's shadow darkens only a part of Earth during a solar eclipse.  People underneath the center of the dark spot (the umbra) will see the total eclipse; while others on the edge (the penumbra) will see a partial eclipse. This shot was taken from the Mir space station in August 1999 and is courtesy the Centre National d'Etudes Spatiales.
The image below is from the Japanese geostationary satellite (MTSAT) and shows the view of Earth at 9:30 a.m. local time in Taiwan, near the time in eastern China when the disk of the Moon completely overlapped the disk of the Sun. (source Wikimedia Commons).

Mr. Eclipse provides a great infographic which explains the geometry behind a solar eclipse, including the umbra and penumbra described above.

Friday, September 16, 2011 ~ Have your say...

A Video of Vesta Rotating in Space

The Dawn team over at NASA has published a simulated flyby of Vesta produced from a topographic model. The model is based on imaging performed during August 2011, when Dawn was in high-altitude mapping orbit. 

At the time, Vesta's north pole was in winter darkness, so the shape model does not quite reach into the northern polar regions. 

The animated gif (upper left) does not do this video justice - watch the high def video below to see the unprecendented level of photographic accuracy we now have available to look from the comfort of our own homes... while this giant rock is barelling through space.  Pretty amazing.




Embedded video from

NASA Jet Propulsion Laboratory California Institute of Technology

References:
Credit: NASA / JPL / UCLA / MPS / DLR / IDA

Friday, September 9, 2011 ~ Have your say...

A Map of the 'Flat' Earth

A Map of the Square and Stationary Earth

In June of 2011, the Library of Congress acquired an old map which was created by Prof. Orlando Ferguson in 1893.  The information it contains is a bit out of date...  but it is very interesting to look at nonetheless.

The text can be a hard to read, so here it is, verbatim:

Header:  Map of the Square and Stationary Earth.

Subheader:  Four hundred passages in the Bible condemn the Globe Theory, or the Flying Earth, and none sustain it.  This map is the Bible Map of the World.

Caption (right side):  These men are flying on the globe at the rate of 65,000 miles per hour around the sun, and 1,042 miles per hour around the center of the earth (in their minds).  Think of that speed!  (this caption was clearly meant to be a sarcastic jab to the Globe Theory)

Footnote:  Send 25 cents to the author, Prof. Orlando Ferguson, for a book explaining this Square and Stationary Earth.  It knocks the Globe Theory clean out.  It will teach you how to foretell eclipses.  It is worth its weight in gold.

The Flat Earth Society (yes, it's actually real)

The Flat Earth Society is a real organization led by a Virginian man named Daniel Shenton. Shenton believes in other scientific principles and facts, such as evolution and global warming, but he and his followers also believe that the Earth is a disc that you can fall off of.  In other words, that it's flat.

"I haven't taken this position just to be difficult," Shenton told The Guardian news a while back. "To look around, the world does appear to be flat, so I think it is incumbent on others to prove decisively that it isn't. And I don't think that burden of proof has been met yet."

In fact, the validity of the organization as come in to question so often that it's immediately addressed on the first line of the FAQ:

Q: "Is this site a joke?"

A: This site is not a joke. We are actively promoting the Flat Earth movement worldwide. There are members who seriously believe the Earth is flat, and their research is located in Flat Earth Believers.

Read through their FAQ, as they "explain" the seasons, sunrises, sunsets, and other phenomena.

Here's a map of the flat Earth that they present:


I'm not sure where to start when debunking the notion of a flat Earth, because the theory seems so unrealistic.  So I will only present one piece of evidence for the round Earth, and it's a simple picture:


'Nuff said.

  • To see more images of Earth, our Pale Blue Dot, click here.


References:
http://www.thehistoryblog.com/archives/11651
http://theflatearthsociety.org/cms/
http://www.theflatearthsociety.org/forum/index.php?topic=11211.0

Saturday, September 3, 2011 ~ Have your say...

Milky Way Creation Simulation (video)

For decades, astrophysicists have attempted to recreate the formation of spiral galaxies such as the Milky Way as realistic as possible. 

Recently, a groupd of astrophysicists from the University of Zurich demonstrated the world's first realistic simulation of the creation of the Milkey Way galaxy.  The simulation was done in collaboration with astronomers from the University of California at Santa Cruz. 

The new results were partly calculated on the computer of the Swiss National Supercomputing Center (CSCS) and show, for instance, that there must be stars on the outer edge of the Milky Way.

"The simulation follows the interactions of more than 60 million particles of dark matter and gas. A lot of physics goes into the code--gravity and hydrodynamics, star formation and supernova explosions--and this is the highest resolution cosmological simulation ever done this way," said astrophysist Guedes.

Just how complex was this simulation? It was calculated in 8 months at the Swiss National Supercomnputing Centre at Manno, Switzerland. It would take 570 years of comptuational time to run the same simulation on a personal computer.

And here it is - the formation of our Milky Way galaxy:

Thursday, September 1, 2011 ~ Have your say...

Tempest Milky Way: a stunning example of time-lapsed photography

Produced by Randy Halverson and shot in central South Dakota, this is a stunning example of time lapsed photography of our Milky Way galaxy with a backdrop of electrical storms in the background.


From the Vimeo page:
"One of the challenges in making this video, was trying to get good storm with stars shots. The opportunity doesn't come along very often, the storm has to be moving the right speed and the lightning can overexpose the long exposures. I had several opportunities this summer to get storm and star shots. In one instance, within a minute of picking up the camera and dolly, 70mph winds hit. One storm was perfect, it came straight towards the setup, then died right before it reached it."
Visit his page to see more: http://vimeo.com/28040685

Friday, August 19, 2011 ~ Have your say...

Astronaut Photographs Perseid Meteor... From Space

This is what a meteor looks like from the space station:












NASA astronaut Ron Garan was fortunate enough to photograph a Perseid metor through through a space station window.  

"What a 'Shooting Star' looks like #FromSpace Taken yesterday during Perseids Meteor Shower..." Garan tweeted from his Twitter account last Sunday.  Interestingly, the meteor doesn't look much different from a meteor you would see from the ground, except for one thing: it's falling away from the observer (Garan); whereas for us viewing the Perseids on Earth, they fall toward us.

You can follow Ron Garan on Twitter here... and here's another one of this pictures - Chicago at night:


Reference:
Image credit: Ron Garan/NASA

Monday, August 15, 2011 ~ Have your say...

The Moon Landing Hoax Debunked (again)










To The Moon!

American President Barack Obama’s presented to the National Academy of Sciences on April 27th, 2009.  Here is a excerpt from his speech:

“When the Soviet Union launched Sputnik a little more than a half century ago, Americans were stunned: the Russians had beaten us to space. We had a choice to make: we could accept defeat – or we could accept the challenge. And as always, we chose to accept the challenge.

President Eisenhower signed legislation to create NASA and to invest in science and math education, from grade school to graduate school. And just a few years later, a month after his address to the 1961 Annual Meeting of the National Academy of Sciences, President 

Kennedy boldly declared before a joint session of Congress that the United States would send a man to the moon and return him safely to the earth.

The scientific community rallied behind this goal and set about achieving it. And it would lead not just to those first steps on the moon, but also to giant leaps in our understanding here at home.”

One Small Step

It was on July 20th, 1969, that Apollo 11 commander Neil Armstrong stepped out of the lunar module and took the first small step on the lunar surface, but a giant leap for mankind.  NASA beamed back audio, video, and images from the historic mission.  Ask most people from that era, “Where were you when we first walked on the moon?”, and they can remember the day as if it was yesterday.  It was completely memorable, and not only a historic moment for the United States of America, but for science and all of humanity.

NASA launched six missions that would go on to land on the moon;  Apollos 11, 12, 14, 15, 16.  They studied things like soil mechanics, meteoroids, seismic measurements, heat flow, lunar ranging, magnetic fields and the solar wind.  It was the ultimate laboratory, and we learned much from those trips.  

The Conspiracy

But what if the United States didn’t land on the moon?  What if there was a conspiracy to give the illusion that they did?  What if the public was fooled into thinking that ‘1969 America’ could win the space race?  And if the government lied, what else were they lying about?  What else do they not want us to know?  What if… the moon landing was a hoax?

In February of 2001, Fox TV aired a program called “Conspiracy Theory:  Did We Land on the Moon?”.  It featured interviews with a group of people who believe that NASA faked the Apollo moon landings.  The biggest proponent of this idea was Bill Kaysing, who claimed to have evidence for the hoax:  images, engineering details, anomalies in the physics, and astronaut testimonies.  According to Kaysing, NASA did not have the technical capability of landing on the moon, but since there was so much pressure during the Cold War and space race with the Soviet Union, the USA was forced to fake the whole thing to prove that they had technological superiority.  To Kaysing and others believer in the conspiracy, it was easier to fool the public with an elaborate hoax (assumed to be filmed in Area 51, of course) rather than let their Cold War rival strike a huge moral victory by having a non-American step foot on the moon first.

Scan the Internet for “Moon Landing Hoax”, and (other than this site), you’ll find other reasons for the conspiracy, including the following, from MoonMovie.com:

"Why would Apollo fake the first manned moon mission (Apollo 8) and then continue to go back 8 more times? To answer this question, one must understand both history and the future. 

Technology is far beyond what the public is allowed to know - in some cases 35 years ahead of public knowledge.

The elite handlers of the Military Industrial Complex (MIC) needed a long term distraction from the real space program, for the purposes of covertly building the vast control mechanisms and placing them in Earth orbit.

Bart Sibrel touches on this in his first film, when he includes the real reason for space presence - military domination of the Earth from space. This is the history. Another resource for this documented movement towards worldwide tyranny is Arsenal of Hypocrisy. NASA is a multifaceted tool of the MIC, and the Global Elite who plan to implement world government. 

Apollo was in fact, a great distraction."

And so, putting the reason for the hoax aside, let us investigate why some people believe man has yet to step foot on the moon.  At the same time, we’ll put on our skeptical hats and let science debunk each of the claims.

Claims for the Conspiracy… and the Facts That Debunk Them

According to moon hoax believers, the list below provides “evidence” for the fact that the moon landing was staged in a studio.  (Editors note:  For the sake of brevity, I have chosen eleven.  If you wish to find more “evidence” and counter evidence (science), please read through the reference material at the bottom of the article.  The most comprehensive guide I have yet to find is on Phil Plait’s Bad Astronomy site).

1  When the astronauts plant the flag, you can see it flapping as though it’s in a breeze.  But there is no air or atmosphere on the moon… so how could this be?

The flag is moving because the astronauts just placed it there, and by twisting and turning the flag pole, they caused it to move.  The inertia from when they let go kept it moving,  Over time, the flag would come to rest, but the video was taken during and shortly after it was placed into the lunar surface.

2  Buzz Aldrin is seen in the shadow of the lander, but at the same time, he is clearly visible. Many shadows look strange in the Apollo pictures. Some shadows don't appear to be parallel with each other, and some objects in shadow appear well lit, hinting that light was coming from multiple sources… just like studio cameras.

There were multiple light sources:  the sun, the Earth's reflected light, light reflecting off the lunar module, the spacesuits, and also the lunar surface.

It's also important to note that the lunar surface is not flat.  If an object is in a dip (say, a small crater), you will get a different shadow compared to an object next to it that is on a level surface.  Still not convinced?  This is easily testable at with a few small props, uneven ground, and a light source.

In addition, the shadows are not parallel in the images due to perspective.  You are looking at a three-dimensional scene, projected on a two-dimensional photograph, which causes distortions. When the Sun is low and shadows are long, objects at different distance do indeed appear to cast non-parallel shadows, even here on Earth. Here’s a great example demonstrating this effect – non parallel shadows distorted by perspective. Again, this is easily testable, as the previous link demonstrates.

3  You’re on the moon and there’s no atmosphere.  So you should be able to clearly see all the stars in the sky.  But where are they?  They don’t show up in any of the photographs – it’s just a dark sky.

The moon's surface reflects sunlight, and its glare would have made stars difficult to see. Also, the astronauts photographed their lunar adventures using fast exposure settings, which would have limited incoming background light. According to Bad Astronomy, they were taking pictures at 1/150th or 1/250th of a second.  With such a short exposure, the stars simply won’t show up on film.  You can try this for yourself.  Take a picture of Jupiter or Venus (since they are highly visible from Earth) on a clear night away from light pollution.  You’ll have a hard time seeing them, if at all, and you certainly won’t see even the brightest stars.  You need a long and steady exposure for that to work.

4  The lander was huge and should have produced a giant crater when it touched the surface.  But the module is shown sitting on relatively flat, undisturbed soil.

"Science fiction movies depict this big jet of fire coming out as [spacecraft] land, but that's not how they did it on the moon.".  In reality, the lander's engines were throttled back prior to landing, and it did not hover long enough to form a crater or disturb much dust.
5  The radiation in the van Allen Belts and in deep space would have killed the astronauts in minutes.

Kaysing's exact words, when quoted on this claim, were, ``Any human being traveling through the van Allen belt would have been rendered either extremely ill or actually killed by the radiation within a short time thereof.''

The van Allen belts are regions above the Earth's surface where the Earth's magnetic field has trapped particles of the solar wind. An unprotected human would get a lethal dose of radiation, but only if he stayed there long enough. But according to Phil Plait, the spaceship traveled through the belts very quickly, getting through them in about an hour. There wasn't enough time to get a lethal dose.  Additionally, the metal hull of the spaceship blocked most of the radiation.

6  The pictures taken from the Moon were exposed and set.  Just about every picture the public sees is near perfect, with the scene always centered perfectly. However, the cameras were mounted on the front of the astronauts' spacesuit, and there was no finder. They couldn't have taken perfect pictures every time!

Nobody claims they did. Thousands of pictures were taken on the Moon, and the ones we all see will tend to be the best ones. If Buzz Aldrin accidentally took a picture with Neil Armstrong partly out of the frame, you probably won't see that image in a magazine.

Further to that, Phil Plait notes that everything done on the Moon was practiced endlessly by the astronauts. Those working on the mission knew that these pictures would be some of the most important images ever taken, so they would have taken particular care in making sure the astronauts could do it with their eyes shut. When fabled astronaut Story Musgrave replaced a camera on board the Hubble Space Telescope in 1993, someone commented that he made it look easy. "Sure," he replied, "I had practiced it thousands of times!"

7  The astronauts' footprints are too clear for being made on a dry surface. Those footprints could only have been made in wet sand.

Plait, an astronomer and skeptic, deals with this claim nicely:  Moon dust, or regolith, is "like a finely ground powder. When you look at it under a microscope, it almost looks like volcanic ash. So when you step on it, it can compress very easily into the shape of a boot." And those shapes could stay pristine for a long while thanks to the airless vacuum on the moon.

8  We are led to believe that only two astronauts walked on the moon at a time, yet in photographs such as the one below, where both are visible, there is no sign of a camera. So who took the picture?

According to Phil Plait, the cameras were mounted to the astronauts' chests.  In the picture above, Plait notes, "you can see [Neil's] arms are sort of at his chest. That's where the camera is. He wasn't holding it up to his visor."

9  There are many strange reflections in the photos.  They could only have come from studio lights on a production set.

If NASA spent millions of dollars on a hoax, do you think they would make such an obvious mistake?  The reflections are lens flares.  The pentagonal flare seen in some photos is of the aperture of the camera. 


10  After the “landing”, artifacts from the trip were supposedly left behind:  part of the Eagle, the U.S. flag, and several other instruments and mementos.  With instruments like the Hubble Space Telescope capable of peering into the distant of the universe, surely scientists should be able to see the various objects still on the moon. But no such pictures of these objects exist.

There isn’t a single telescope on Earth or in space that has a resolution powerful enough to see these objects. In fact, astronomers can calculate this:  given the biggest telescope on Earth, the smallest thing you can see on the surface of moon is something bigger than a house.

11 There’s secret outtake footage from the old Moontruth website that shows a bumble when they were staging the landing.  You can clearly see it was a production set.

That’s because it was a production set.  You can watch it yourself:



Moontruth.com eventually came out as a parody, publishing a disclaimer stating that the clip was a fake. This doesn't stop people from believing that it still supports the hoax, however. In fact, in true conspiracy theorist fashion, the admission that it was a fake video is seen as “part of the conspiracy”, or “what they want you to think”.

From NASA, With Love

After the show on Fox aired, NASA felt compelled to respond.  On their web page, they present the most compelling piece of evidence as proof of the moon landings.  Actually, they present 841 pounds of evidence in the form of moon rock.  Moon rocks are absolutely unique, and there’s no process on Earth that could simulate their creation.  That is, they can only be created on the moon itself.  To learn how they differ from Earth rocks, and how their creation is different, visit NASA’s rebuttal on their site.

Dr. David McKay, Chief Scientist for Planetary Science and Exploration at NASA's Johnson Space Center (JSC) is quoted:  "I have here in my office a 10-foot high stack of scientific books full of papers about the Apollo Moon rocks.  Researchers in thousands of labs have examined Apollo Moon samples -- not a single paper challenges their origin! And these aren't all NASA employees, either. We've loaned samples to scientists in dozens of countries [who have no reason to cooperate in any hoax]."

Even Dr. Robert Park, Director of the Washington office of the American Physical Society and a noted critic of NASA's human space flight program, agrees that humans have indeed landed on the moon. He was quoted by NASA in saying, "The body of physical evidence that humans did walk on the Moon is simply overwhelming."

Conclusion 

Conspiracy theories like the Moon Landing Hoax can be debunked, torn apart, shredded, and thoroughly disproved with hard science every day, but that usually won’t make a difference to true believers.  The Mythbusters, a television show on the Discovery network, dedicated an episode to the Moon Landing Hoax and tackled several parts of the myth.  Like me, the cast members held no illusions that they would be able to sway the diehard moon hoax believer to the “other side”.

"The thing that I've found over the years is that there is always a certain segment of people out there who will refuse to believe despite overwhelming evidence. Those diehards will never be convinced, while everyone else will have fun watching us take on the hoax," said cast member Imahara.

Savage and Hyneman said they found similarities between the hoax and the other myths they have tested.  "There seems to be a common tendency among conspiracy theorists, as well as among a lot of people with entrenched belief systems, to get stuck on an idea and never give up. 

Conspiracy theories are not really a special category -- maybe you can call them myths, but I look at them as an obsession that people want to maintain, like being abducted by aliens, Bigfoot and so on. You can't really expect that reasonable evidence will change anyone's mind if they are determined," observed Hyneman.

And so, we fight the good fight with science, reason, and rationality – chipping away at conspiracy theories like the Moon Landing Hoax with the hope that at least some hoax believers, when presented with the evidence, will let go of their belief and choose to accept the facts.




References:

Interview with Bill Kaysing:  (Editors note:  I left out Kaysing's claim that NASA murdered three astronauts via the Apollo 1 fire because they were afraid the hoax would be exposed.  You can read more about this accusation in the interview, and on Phil Plait's Bad Astronomy article).
NASA’s response:
The ultimate debunk of the Moon Landing Hoax:
Images:
Other:




Wednesday, August 10, 2011 ~ Have your say...

Nemesis, Nibiru, Planet X, and The End of the World (in 2012)

I simply cannot wait to post on this blog on December 22nd, 2012.  When the world hums along like it usually does, what will the doomsayers say? Will they realize they 'made an error' in their calculation and pick a new date? Will they argue that the "we were spared" at the last moment? What will the authors of all the 2012 "end of the world" books do - refund their money?

The End of the World As We Know It has been proclaimed on hundreds of occasions before, and has never proven to be true (obviously, or you wouldn't be reading this). Of course, the world *will* end, at some point, far from now. But it won't be on December 21st, 2012, and it won't be due to Nemesis, Nibiru, or Planet X. 

Jet Prepulsion Laboratory's Donald Yeomans dispels the myths surrounding this doomsday prophecy and discusses some real science behind it in the video below:

Credit: NASA/JPL

Some scientists suggest that a star exists, known as "Nemesis", which helps to explain a perceived periodicity in mass extinctions on Earth. As Nemesis travels through space, it supposedly regularly disturbs comets in the Oort Cloud, sending large numbers of the icy projectiles on a collision course with Earth.

As read on Space.com, the problem with that idea, according to a new study, is that Earth shows no evidence that giant impacts have occurred with any regularity or periodicity. The pattern appears to be a statistical artifact.

"There is a tendency for people to find patterns in nature that do not exist," said study author Coryn Bailer-Jones, of the Max Planck Institute for Astronomy in Heidelberg, Germany, in a statement. "Unfortunately, in certain situations traditional statistics plays to that particular weakness."  This is another example of "patternicity".

Earth has, of course, been impacted by asteroids and comets throughout its 4.5-billion-year history. As many of us know, it's believed that a massive impact is thought to have destroyed the dinosaurs 65 million years ago.

Back in the 1980s, scientists reported seeing a periodic cycle in these catastrophic events, noting that they appear to have occurred approximately every 26 million years over the last 250 million years.  It was proposed that a companion star to the sun - dubbed Nemesis - could be responsible for this pattern if it made regular passes near the Oort Cloud.

Some studies of Earth's craters have supported the Nemesis idea, finding evidence of periodic variations in the impact rate. Every so often — the numbers vary between 13 million and 50 million years — the impact rate seems to go up.

The new study, however, contradicts those claims, finding that Nemesis — like the rogue planet Nibiru that some conspiracy theorists say will destroy Earth next year — is probably a myth.

Bailer-Jones used Bayesian analysis — a different kind of statistical technique — and found no such pattern. His results show a different trend: From about 250 million years ago to the present, the impact rate, as judged by the number of craters of different ages, increases steadily.

There are two possible explanations for this apparent increase, according to the study, which was published online in June in the journal Monthly Notices of the Royal Astronomical Society.

1 -   Smaller craters erode more easily, and older craters have had more time to erode away. The trend could simply reflect the fact that larger, younger craters are easier to find than smaller, older ones.  "If we look only at craters larger than 35 kilometers (22 miles) and younger than 400 million years, which are less affected by erosion and infilling, we find no such trend," Bailer-Jones said.

2 -   The increasing impact rate could be real. For example, analyses of impact craters on the moon— where there are no geological processes that can cover up, erode, or fill in craters — show a similar pattern.

Whatever is causing the apparent increase in impacts, the new study casts doubt on the existence of Nemesis.

"From the crater record, there is no evidence for Nemesis," Bailer-Jones said. "What remains is the intriguing question of whether or not impacts have become ever more frequent over the past 250 million years."

And so we must conclude that it is still possible that the sun could have an undiscovered large companion lurking far away, perhaps a red dwarf star or a brown dwarf... but it's not likely that this companion has ever wreaked havoc on Earth in the past, or will spell our doom in the future.



Monday, July 18, 2011 ~ Have your say...

NASA's Dawn Spacecraft: An Infographic

On Saturday, NASA’s Dawn spacecraft arrived at the 330 mile wide asteroid, Vesta. It’s the first space probe to orbit a protoplanet in the asteroid belt.


Dawn will conduct a year-long study of Vesta where NASA hopes to gain an understanding of the origins and earliest conditions of the solar system. The research will also help determine why Vesta is the brightest asteroid in the solar system.


NASA chief, Charles Bolden said, “Dawn’s study of the asteroid Vesta marks a major scientific accomplishment and also points the way to the future destinations where people will travel in the coming years. President Obama has directed NASA to send astronauts to an asteroid by 2025, and Dawn is gathering crucial data that will inform that mission.”


Dawn will then visit the dwarf planet Ceres (arriving in 2015).


Here’s an infographic detailing Dawn’s mission:




Image Credit:   Space.com:  http://www.space.com/12279-nasa-dawn-asteroid-mission-works-infographic.html

Thursday, July 7, 2011 ~ Have your say...

First iPhones in Space: Final Shuttle Astronauts to Deliver $1 App

This news item, courtesy of Mashable, got my attention because it is oh-so-very-cool.  "The final, much-delayed mission of Space Shuttle Atlantis, which has a 30% chance of lifting off this Friday, will be carrying with it the planet’s first astro-phones — a pair of Apple iPhone 4s, ready for a first-of-its-kind experiment aboard the International Space Station, using a $1 app.


The app, SpaceLab for iOS, uses the iPhone 4′s in-built three-axis gyroscope to replace far more expensive custom-built equipment. It will measure altitude, the curvature of the Earth, and locate itself by looking for recognizable coastline via the iPhone camera. (Astronauts aboard the ISS will be taking the snapshots...)"


From the iTunes description... "The primary purpose of these experiments is to collect data for future flights, to improve the sensor accuracy and precision, and to demonstrate some of the basic capabilities intrinsic to iPhone but uniquely applied to the Low Earth Orbit (LEO) space environment."


Once the experiment and iPhones are returned to Earth and analyzed, it will be made available to users as part of a new release."


You can pick up the app here.  Remarkable, I still haven't jumped on to the iPhone bandwagon... I have to resort to my second generation iPod Touch.

Monday, June 27, 2011 ~ Have your say...

Asteroid Just Barely Misses Earth... Asteroid 2011 MD: A Near-Earth Object

"An asteroid the size of a tour bus zipped by Earth today (June 27) in a flyby so close that the space rock was nearer to the planet than some satellites."  At 5 to 20 metres wide, this guy would have burned up in the atmosphere yielding a magnificent light show, but probably wouldn't have caused any damage. It wasn't one of these asteroids below, but these ones would be ideal candidates for humans to visit so that we could learn more about them.


Image credit: http://www.space.com/12079-asteroids-5-reasons-explore-space-rocks.html - Emily Lakdawalla/Ted Stryk


To see just how close this asteroid was to Earth, look check out this page:  http://neo.jpl.nasa.gov/images/2011md_ca3.gif .  Its distance was less than the diameter of the Earth... so yeah, very close!

Monday, May 30, 2011 ~ Have your say...

Why does the moon look bigger on the horizon?

An explanation of the “Moon Illusion”.

When you look up at the evening sky as the moon begins to rise above the horizon, it seems to swell and then retract as it goes higher in the sky. This effect, where the moon looks bigger along the horizon, is known as the “moon illusion”. It’s not only limited to the moon - it can also be seen as the sun rises as sets. You can dispel the illusion by covering one eye or using a telescope. Humans’ binocular vision is only part of the reason behind the disparity in size. Not convinced? You can also hold a coin or another object up to the moon as it travels through the sky to provide a point of reference to see that the moon remains the same size despite its appearance.

How does the moon illusion work?

The true cause of the moon illusion is a mystery to scientists, both ancient and modern. The strange thing? The moon is actually roughly 1.5% smaller when it is near the horizon than when it is high in the sky, because it is farther away by up to one Earth radius.

One theory hypothesizes that the illusion occurs because when the moon or sun are along the horizon, your brain has more objects to use as a reference, thus allowing it to compare against size and distance. When you have the skyline with trees, buildings, and other objects, your brain tends to interpret the moon as larger than those objects. However, when the moon is far above the horizon, your brain has fewer objects to use as a reference to compare to the size of the moon. Therefore, when the moon is in the empty sky, it appears smaller.


The Ponzo Illusion: how to trick your brain

Part of the reason your brain has such a hard time interpreting the size of the moon in the sky is because the moon’s size does not change as it goes across the sky. Other objects in the world around you (that are not in the sky) appear to be smaller as they move closer to you and gain size as they move farther away. This expectation is physiologically imprinted in your brain. Optical illusions that you may have seen where you compare the size of two lines or circles, such as the Ponzo Illusion, illustrate your brain's ability to trick itself based on the sizes of objects.  Note that in the Ponzo illusion, due to the converging lines, the image that is "further" appears to be larger - even though it is the same size as its foreground version.


Conclusion? Not quite yet…

There is no complete or concrete explanation of why we see a disparity in the moon's size as it moves through the sky. More research is needed to determine what visual cues cause changes in our perception over long distances, and it is possible there is no single theory to explain the moon illusion, since it could be the combination of many processes at once.  This article was by no means a detailed explanation of the problem, but more of an introduction.  To read more about the moon illusion, and the theories used to understand it, visit the references below.



References:

Tuesday, May 24, 2011 ~ Have your say...

Shuttle Endeavor Photographed While Docked to the ISS

The Endeavor shuttle is on its last mission for the NASA space program – a sad moment for astronomers and space enthusiasts. But on this final mission, Endeavor has made a first in space history: it’s the first shuttle to be photographed from another space vehicle while docked to the International Space Station (ISS). The photo (below) was taken from the Soyuz TMA-20 spacecraft, 600 meters from the ISS as the crew backed off.

One can only imagine the complexities of docking a space shuttle to a space station without error.  In the photo, you can see the shuttle tilted backwards, docked to the left of the ISS.


In 1995, shuttle Atlantis was photographed while docked to the Russian Mir Space Station, resulting in one of the most iconic images ever taken during the space program (below). 


I look forward to the future of the space program, as we enter into the private realm over the next few years. 

 Image credit: NASA, Roscosmos, NASA TV

Saturday, April 23, 2011 ~ Have your say...

The Solar Dynamics Observatory: Year One Video Collage

NASA has recently released a video collage from the Solar Dynamics Observatory (SDO). In the last year, the sun has gone from its quietest period in years (the solar minimum) to the activity marking the beginning of solar cycle 24. SDO has delivered incredible images of solar flares, eruptions of prominences, and the early stages of coronal mass ejections. This video demonstrates some of the most amazing events over the last year.




According to NASA’s website, in the order they appear in the video, the events are:

1. Prominence Eruption from AIA in 304 Angstroms on March 30, 2010
2. Cusp Flow from AIA in 171 Angstroms on February 14, 2011
3. Prominence Eruption from AIA in 304 Angstroms on February 25, 2011
4. Cusp Flow from AIA in 304 Angstroms on February 14, 2011
5. Merging Sunspots from HMI in Continuum on October 24-28, 2010
6. Prominence Eruption and active region from AIA in 304 Angstroms on April 30, 2010
7. Solar activity and plasma loops from AIA in 171 Angstroms on March 4-8, 2011
8. Flowing plasma from AIA in 304 Angstroms on April 19, 2010
9. Active regions from HMI in Magnetogram on March 10, 2011
10. Filament eruption from AIA in 304 Angstroms on December 6, 2010
11. CME start from AIA in 211 Angstroms on March 8, 2011
12. X2 flare from AIA in 304 Angstroms on February 15, 2011

This video is public domain and can be downloaded at: http://svs.gsfc.nasa.gov/goto?10748

I can't help but wonder what we'll discover in the future as our technology improves even further.  Imagine what other stars look like?  What about a red giant?  White dwarf?  Neutron star?  Watching this video really puts things in perspective for me - I've watched it a dozen times, and can't help but feel that our planet is just so tiny, so insignificant, compared to the complexities and magnitudes of our solar system, galaxy, and universe.  I can only imagine what the video for Year 2 will comprise.




Sunday, April 3, 2011 ~ Have your say...

12 Natural Wonders of the World

Our planet is home to a number of natural wonders, and it’s difficult to pick out the "best" ones since, at least for this post, the list is subjective.  Inspired by the 7 Natural Wonders of the World website, I decided to pick out a dozen of my favorite.  Here are 12 awe-inspiring natural wonders of the world which go to show that you don’t need to invoke the paranormal, myths, legends, and folklore to see the stuff of dreams

Click on the images below to see the larger version.

Angel Falls:  the world’s highest waterfall with a height of 979 meters (just shy of a kilometer!).  Incredibly enough, because the height is so great, much of the water is evaporated before it even reaches the ground below.

Chocolate Hills:  An example of conical Karst topography, and located in Bohol, Philippines, there are over 1,776 hills composed of grass-covered limestone.  During  dry season, the grass dries up, forming the chocolate color.

Davolja Varos (the Devi’s Town):  Features just over 200 formations described as 'earth pyramids', ranging in height from 2-15 m tall.  They were created by the erosion of the soil in an area that previously had intense volcanic activity.

The Aurora (Borealis and Australis):  A natural display of light visible at night and at the poles of the Earth, which occurs when charged particles directed by the Earth’s magnetic field collide high up in the ionosphere.

Jeita Grotto:  Two karstic limestone caves with a length of nearly 9 kilometres.  The dissolution of limestone by carbonic acid formed this majestic cave over millions of years.

Victoria Falls:  “The Smoke That Thunders” is located in southern Africa and is the world’s largest waterfall at a height of 108 m and a width of 1,708 m.

Meteor Crator:  A meteorite impact crater in Arizona, it is 1.2 km across, 170 m deep, and is surrounded by a rim 45m in height.  It is approximately 50,000 years old, and was created with a 50 m wide nickel-iron meteorite slammed into the Earth at some 12.8 km/s (72,420 km/h).

Aldabra:  The world’s second largest coral atoll is located in the Indian Ocean.  Loosely speaking, an atoll is a ring shaped ribbon reef enclosing a lagoon.  Aldabra is home to the Aldabra tortoise, and is also considered a World Heritage Site.

Perito Mereno Glacier:  Located in Argentina, it is 30 km in length and is considered the third largest reserve of fresh water in the world.  It is one of only three Patagonian glaciers that is actually growing.

Tsingy de Bemaraha:  A wonderful example of Karst topography, the park is located near the western coast of Madagascar and is considered a World Heritage Site.  It’s undisturbed forests, lakes, and mangroves form the habitat for rare and endangered lemurs and birds.

Uluru:  Also know as Ayers Rock, it is a huge sandstone rock formation located in Australia.  It is one of Australia’s most recognized icons, and measures in at 9.4 km in circumference, and 348 m in height.  An island mountain, it survived as the surrounding rocks eroded due to its lack of jointing and parting at the bedding surfaces.

Purnululu National Park:  Located in the north east of Australia, the park is famous for its striped sandstone domes, alternating in orange and grey bands.  The banding of the domes is due to differences in the clay’s content and the porosity of the sandstone layers.

The Milky Way:  The galaxy in which we live is home to an estimated 100 billion stars or more, and has a diameter of 100,000 light years.  Under near-perfect conditions (zero pollution, very dark, clear atmosphere, etc), the naked eye can detect upwards of 45,000 stars.




References:
All Images:  from the respective WikiPedia articles below


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