By CHRISTINA CARON from NYT Science https://www.nytimes.com/2018/12/15/science/green-comet-46p-wirtanen.html?partner=IFTTT
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By CHRISTINA CARON from NYT Science https://www.nytimes.com/2018/12/15/science/green-comet-46p-wirtanen.html?partner=IFTTT
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