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Earth, Mars, Venus — and a long-lost planet — may have once 'waltzed' in perfect harmony around the sun
New simulations suggest that up to four of the solar system's rocky planets, including Earth and a long-lost world, once ...
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The first close-up images of Mars still elicit wonder, 60 years after they were captured
Mariner 4, built by JPL in Pasadena, took the images on July 14, 1965. One of the mission's leaders reflects on decades of studying the Red Planet.