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Voyager 1's portrait of Earth. (Image credit: NASA/JPL) On February 14, 1990, Voyager was turned to take images of the Solar System. The Earth was there, the "pale blue dot" Carl Sagan christened it. Mona Evans, "Voyager 1 - Gas Giants and a Last Look Homeward"

Earth Waves at Cassini on July 19, 2013. From more than 40 countries and 30 U.S. states, people around the world shared more than 1,400 images of themselves as part of the Wave at Saturn event organized by NASA's Cassini mission. The Cassini team created this image collage as a tribute to the people of Earth. (Credit: NASA/JPL-Caltech/People of Earth)

NASAfrom NASA

Lava Flow on Mawson Peak, Heard Island

Lava Flow on Mawson Peak, Heard Island. The images show proof of an eruption on Mawson Peak. By 2013.04.07 Mawson's steep-walled summit crater had filled, and a trickle of lava had spilled down the volcano’s southwestern flank. On April 20, the lava flow remained visible & had widened slightly just below the summit. Natural-color images were collected by the Advanced Land Imager (ALI) on the Earth Observing-1 (EO-1) satellite. (Image Credit: NASA Earth Observatory)

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The Clearest Images Of Another Planet You've Ever Seen

Mars. The Clearest Images Of Another Planet You've Ever Seen Now that the Curiosity rover is good and settled, it's starting to take in some scenery.

Lava flows on Mt. Etna 2013-02-19. (Credit: NASA, Earth Observing-1 satellite) The false-color image combines different wavelengths to differentiate different features. Bright red is the fresh lava, the blue-green is snow, clouds are white, vegetation is green, dark gray areas are old lava flows. ©Mona Evans, “Volcanoes – Fire and Ice” http://www.bellaonline.com/articles/art53591.asp

Earthrise . Taken from Apollo 8 on the first manned voyage around the Moon, Christmas Eve 1968. It has been called "the most influential environmental photograph ever taken." (Credit: William Anders, NASA image AS8-14-2383) Mona Evans, "Christmas in the Skies" http://www.bellaonline.com/articles/art36154.asp

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Top 5 Habitable Alien Planets…

From the Kepler data we're finding new planets all the time. Many are more earthlike in size and some are in the habitable zones of their stars. This doesn't mean there is any kind of life on them. There are many other factors that could make them uninhabitable. Mona Evans, "Searching for Extrasolar Planets", http://www.bellaonline.com/articles/art66984.asp

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Mapping Voyager 1's Incredible 36-Year Mission Through Space [INFOGRAPHIC]