File:ISS-40 Polar mesospheric clouds.jpg
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English: Polar mesospheric clouds (PMC) are featured in this image photographed by an Expedition 40 crew member on the International Space Station when the space station was flying over southern Ukraine. Wispy and hard to see, PMC form far above the usual level for clouds, 80-100 kilometers above the ground, so that crews flying at approximately 350 kilometers are ideally placed to observe them. PMC usually only appear near the poles, but during the past few decades they have appeared as far south as Colorado and Virginia in the USA. They also appear brighter and thicker. Scientists think that these changes are related to long-term climate change, perhaps from increasing water vapor content in the upper atmosphere. |
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| Source | https://www.flickr.com/photos/nasa2explore/15073007709/ |
| Author | NASA |
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This image or video was catalogued by Johnson Space Center of the United States National Aeronautics and Space Administration (NASA) under Photo ID: ISS040-E-87315. This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing. Other languages:
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This file is in the public domain in the United States because it was created by the Image Science & Analysis Laboratory, of the NASA Johnson Space Center. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (NASA media use guidelines or Conditions of Use of Astronaut Photographs).
Photo source: ISS040-E-87315.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 02:16, 31 January 2015 | | 4,256 × 2,832 (1,002 KB) | Ras67 (talk | contribs) | =={{int:filedesc}}== {{Information |description={{en|1=Polar mesospheric clouds (PMC) are featured in this image photographed by an Expedition 40 crew member on the International Space Station when the space station was flying over southern Ukraine. Wi... |
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