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Comet C/2017 K2 Panstarrs - K2

Farthest active inbound comet yet seen. NASA's Hubble Space Telescope has photographed the farthest active inbound comet ever seen, at a whopping distance of 1.5 billion miles from the Sun (Beyond Saturn's orbit). Slightly warmed by the remote Sun, it has already begun to develop an 80,000-mile-wide fuzzy cloud of dust, called a coma, enveloping a tiny, solid nucleus of frozen gas and dust. These observations represent the earliest signs of activity ever seen from a comet entering the solar system's planetary zone for the first time. Source 1v.

K Panstarrs K C Comet

As long as that comet stays in a far orbit away from us I'm fine but if it starts to get closer to us it could spell serious trouble for earth.