File:Mars and Elysium (9458016765).jpg
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| Description | Taking advantage of Mars's closest approach to Earth in eight years, astronomers using NASA's Hubble Space Telescope have taken the space- based observatory's sharpest views yet of the Red Planet. The telescope's Wide Field and Planetary Camera 2 snapped these images between April 27 and May 6, when Mars was 54 million miles (87 million kilometers) from Earth. From this distance the telescope could see Martian features as small as 12 miles (19 kilometers) wide. The telescope obtained these four images, which, together, show the entire planet. Each view depicts the planet as it completes one quarter of its daily rotation. In these views the north polar cap is tilted toward the Earth and is visible prominently at the top of each picture. The images were taken in the middle of the Martian northern summer, when the polar cap had shrunk to its smallest size. During this season the Sun shines continuously on the polar cap. Previous telescopic and spacecraft observations have shown that this summertime "residual" polar cap is composed of water ice, just like Earth's polar caps. These Hubble telescope snapshots reveal that substantial changes in the bright and dark markings on Mars have occurred in the 20 years since the NASA Viking spacecraft missions first mapped the planet. The Martian surface is dynamic and ever changing. Some regions that were dark 20 years ago are now bright red; some areas that were bright red are now dark. Winds move sand and dust from region to region, often in spectacular dust storms. Over long timescales many of the larger bright and dark markings remain stable, but smaller details come and go as they are covered and then uncovered by sand and dust. This image is centered near another volcanic region known as Elysium. This area shows many small, dark markings that have been observed by the Hubble telescope and other spacecraft to change as a result of the movement of sand and dust across the Martian surface. In the upper left of this image, at high northern latitudes, a large chevron-shaped area of water ice clouds mark a storm front. Along the right limb, a large cloud system has formed around the Olympus Mons volcano. |
| Date | |
| Source | Mars and Elysium |
| Author | NASA on The Commons |
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NASA on The Commons @ Flickr Commons |
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This image was taken from Flickr's The Commons. The uploading organization may have various reasons for determining that no known copyright restrictions exist, such as:
More information can be found at https://flickr.com/commons/usage/. Please add additional copyright tags to this image if more specific information about copyright status can be determined. See Commons:Licensing for more information. |
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This image was originally posted to Flickr by NASA on The Commons at https://flickr.com/photos/44494372@N05/9458016765. It was reviewed on 28 September 2015 by FlickreviewR and was confirmed to be licensed under the terms of the No known copyright restrictions. |
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| current | 04:14, 28 September 2015 | | 800 × 800 (246 KB) | Sumita Roy Dutta (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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