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Giant 'diamond ring' sparkles 4,500 light-years away in the Cygnus constellation — Space photo of the week
NASA's SOFIA observatory captured a rare image of a glowing gas ring in Cygnus X — a vast star-forming region 4,500 ...
About 4.5 billion years ago, a colossal impact between the young Earth and a mysterious planetary body called Theia changed ...
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