China and the US are vying to put people on the moon for the first time in more than 50 years in a contest that is as much about economics and geopolitics as it is about technology.
On Jan. 2, 2004, NASA's Stardust spacecraft flew by comet Wild 2 to collect some comet dust and bring it back to Earth. When you purchase through links on our site, we may earn an affiliate commission ...
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