Watts Up With That?: Now visible: Comet as big as the full moon

Hyperactive comet 46P/Wirtanen is approaching Earth for one of the closest Earth-comet encounters of the Space Age. Observers report that the comet’s gaseous green atmosphere now covers a patch of sky as large as the full Moon–and it is growing larger. On Dec. 16th, Comet 46P/Wirtanenwill approach Earth less than 11.5 million km away–making it one…

2018-12-04 22:29

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