The changing face of our planet has been documented in stunning detail over the last 40 years by the longest-running Earth-observing satellite program, called Landsat.
Today, on the 40th anniversary of the launch of the first Landsat satellite, scientists and government officials took time out to commemorate the technology that's revealed our world in a whole new light.
"The Landsat program has given each and every one of us in every part of the world a thoroughly objective, continuous look at ourselves in the mirror since 1972," Anne Castle, assistant secretary for water and science at the U.S. Department of the Interior, said during a news briefing at the Newseum museum in Washington, D.C.
[Slideshow: Ghostly world of the Arctic Circle]?
Landsat is a network of seven Earth-facing satellites that have been launched over the years, starting with the first, which lifted off July 23, 1972, from Vandenberg Air Force Base in California. Currently, two of the most recently launched spacecraft provide a continuous picture of Earth from 400 miles above the ground. [Photos: Landsat's Best 'Earth as Art' Images]
The latest, most technologically advanced Landsat satellite, the Landsat Data Continuity Mission (LDCM), is due to launch in February 2013 from Vandenberg to beam home even more amazing pictures of Earth from space.
"Landsat has really become the gold standard of remote sensing from space," Castle said. "It's provided an invaluable, indelible record of the recent history of our planet."
The satellites have documented some jaw-dropping beautiful sights on planet Earth, such as streaky sand dunes in Algeria, the skull-like shape of Lake Eyre in Australia, and swirling phytoplankton in Sweden that recall Van Gogh's painting "Starry Night."
Landsat has also shown the grimmer side of Earth, particularly changes wrought by humans through construction and climate change. For example, satellite images show fast-retreating glaciers in Alaska, urbanization around Beijing, China, and a significant loss of rainforests in Brazil.
"It's really by stepping back and looking at the Earth, observing these changes in their context from space, can we really understand what's happening," said NASA chief scientist Waleed Abdalati.
[Slideshow: Giant iceberg's birth seen from space]
In honor of the Landsat anniversary, scientists chose the 10 most significant images captured by the satellites over the years. These include a photo of the eruption of Washington State's Mount St. Helens volcano in 1980, a picture of the burning oil set afire by withdrawing Iraqi forces in Kuwait in 1991, and images that formed the first high-resolution, true color map of Antarctica in 2007.
The Landsat program is a collaboration by NASA and the U.S. Geological Survey, an agency of the Interior department. Scientists estimate it costs about 80 cents per U.S. citizen per year, over the lifetime of the program.
"Landsat has given us a critical perspective on our planet over the long term and will continue to help us understand the big picture of Earth and its changes from space," NASA Administrator Charles Bolden said in a statement. "With this view we are better prepared to take action on the ground and be better stewards of our home."
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Copyright 2012 SPACE.com, a TechMediaNetwork company. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.[ [ [['Connery is an experienced stuntman', 2]], 'http://yhoo.it/KeQd0p', '[Slideshow: See photos taken on the way down]', ' ', '630', ' ', ' ', ], [ [['Connery is an experienced stuntman', 7]], ' http://yhoo.it/KpUoHO', '[Slideshow: Death-defying daredevils]', ' ', '630', ' ', ' ', ], [ [['know that we have confidence in', 3]], 'http://yhoo.it/LqYjAX ', '[Related: The Secret Service guide to Cartagena]', ' ', '630', ' ', ' ', ], [ [['We picked up this other dog and', 5]], 'http://yhoo.it/JUSxvi', '[Related: 8 common dog fears, how to calm them]', ' ', '630', ' ', ' ', ], [ [['accused of running a fake hepatitis B', 5]], 'http://bit.ly/JnoJYN', '[Related: Did WH share raid details with filmmakers?]', ' ', '630', ' ', ' ', ], [ [['accused of running a fake hepatitis B', 3]], 'http://bit.ly/KoKiqJ', '[Factbox: AQAP, al-Qaeda in Yemen]', ' ', '630', ' ', ' ', ], [ [['have my contacts on or glasses', 3]], 'http://abcn.ws/KTE5AZ', '[Related: Should the murder charge be dropped?]', ' ', '630', ' ', ' ', ], [ [['have made this nation great as Sarah Palin', 5]], 'http://yhoo.it/JD7nlD', '[Related: Bristol Palin reality show debuts June 19]', ' ', '630', ' ', ' ', ], [ [['have made this nation great as Sarah Palin', 1]], 'http://bit.ly/JRPFRO', '[Related: McCain adviser who vetted Palin weighs in on VP race]', ' ', '630', ' ', ' ', ], [ [['A JetBlue flight from New York to Las Vegas', 3]], 'http://yhoo.it/GV9zpj', '[Related: View photos of the JetBlue plane in Amarillo]', ' ', '630', ' ', ' ', ], [ [['the 28-year-old neighborhood watchman who shot and killed', 15]], 'http://news.yahoo.com/photos/white-house-stays-out-of-teen-s-killing-slideshow/', 'Click image to see more photos', 'http://l.yimg.com/cv/ip/ap/default/120411/martinzimmermen.jpg', '630', ' ', 'AP', ], [ [['He was in shock and still strapped to his seat', 6]], 'http://news.yahoo.com/photos/navy-jet-crashes-in-virginia-slideshow/', 'Click image to see more photos', 'http://l.yimg.com/cv/ip/ap/default/120406/jet_ap.jpg', '630', ' ', 'AP', ], [ [['xxxxxxxxxxxx', 11]], 'http://news.yahoo.com/photos/russian-grannies-win-bid-to-sing-at-eurovision-1331223625-slideshow/', 'Click image to see more photos', 'http://l.yimg.com/a/p/us/news/editorial/1/56/156d92f2760dcd3e75bcd649a8b85fcf.jpeg', '500', ' ', 'AP', ] ]
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Source: http://news.yahoo.com/landsat-satellites-see-40-years-earths-beauty-strife-170312295.html
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