Europe's veteran X-ray telescope XMM Newton photographed an isolated cloud of gas in a distant galaxy cluster that has been puzzling astronomers for four years.
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On June 29, 1971, a Soviet space mission ended in tragedy when three Russian cosmonauts were found dead inside their spacecraft after returning to Earth. See how it happened in our "On This Day In Space" series!
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Some of the most fascinating worlds in our cosmic neighborhood are not planets, but the moons that orbit around them.
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SpaceX is still shooting for July for the first orbital flight of its huge Starship Mars rocket, though the company may not meet that target.
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