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The Planets: Mars Preview
Mars was once a blue water-world studded with active volcanoes. But when its magnetic field and protective atmosphere faded, it became the frozen desert planet we know today. With so many necessary elements in place, did life ever form on Mars?
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Journey back to the beginning of everything: the universe, Earth, and life itself.
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In Greenland, a deserted B-29 bomber awaits rescue for more than fifty years.