Comet PanSTARS as viewed in early 2013. Comets were once thought to be omens (usually bad). Today we know that comets do not represent any sort of mystical phenomena, but while transiting the inner Solar System they certainly can cause trouble. In 1908, a suspected comet exploded over Tunguska, Siberia, and flattened trees for many miles in every direction. It could have been a lot worse.
Last Updated 22 Dec 2020.
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