NASA's Swift observatory ends 20-year mission to study the most powerful explosions since the Big Bang www.livescience.com/space/space-...
livescience.comNASA's Swift observatory ends 20-year mission to study the most powerful explosions since the Big BangNASA's Neil Gehrels Swift Observatory has officially ended its mission after more than 20 years, as it approaches a fiery reentry through Earth's atmosphere.
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