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n2doc

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Home country: USA
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Member since: Tue Feb 10, 2004, 12:08 PM
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Environmental Scientist

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Can You See the Great Wall of China from Space? Not Easily



This picture, apparently the first verifiable photo of the Great Wall of China shot from low Earth orbit, was taken by International Space Station Commander Leroy Chiao on Nov. 24, 2004. Can you find it? Credit: NASA



One popular myth about space exploration is that the Great Wall of China is the only human-built structure that can be seen from space. But it’s not true. The reality is that you can’t easily see the Great Wall from low Earth orbit with the unaided eye. And certainly, the Apollo astronauts couldn’t see it from the Moon, even though that urban legend has been widely circulated.

Canadian astronaut Chris Hadfield, who just returned from five months aboard the International Space Station, reiterated the facts about the Great Wall’s visibility from space. “The Great Wall of China is not visible from orbit with the naked eye,” Hadfield said via Twitter. “It’s too narrow, and it follows the natural contours and colours .”

Additionally, when China’s first astronaut, Yang Liwei, went into space in 2003, he said that he couldn’t see the structure of the Great Wall from out his capsule window.

more


Read more: http://www.universetoday.com/25364/can-you-see-the-great-wall-of-china-from-space/

New Hotspot Identified For Star Birth (big space pic)


by ELIZABETH HOWELL
A nebula named after a cat’s paw may be a stealthy spot for a lot of star birth. New observations of NGC 6334 revealed fainter stars than ever before seen, leading astronomers to believe there could be many star babies within the nebula.

You can see the results in the false-color picture above: red for new observations with the National Optical Astronomy Observatory’s Extremely Wide-Field Infrared Imager (NEWFIRM), green for the orbiting Spitzer Space Telescope and red for the Herschel Space Telescope that recently ended its mission.

“The observations acquired with NEWFIRM allowed us to identify and separate out the large number of contaminating sources, including background galaxies and cool stellar giants in the galactic plane to obtain a more complete census of the newly-formed stars,” stated Lori Allen, an NOAO team member.


Read more: http://www.universetoday.com/102617/new-hotspot-identified-for-star-birth/
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