Two comets are headed for a historic flyby of Earth this week, and you don't want to miss them.
The bigger of the two bodies, known as 252P/LINEAR, is about 750 feet in size and surrounded by an emerald green cloud of gas. It is expected to make its closest approach to our planet on March 21 at...
via L.A. Times - Science http://ift.tt/1RsWiMO
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