When we think of comets we instinctively think of Halley's Comet that swings by once every 75 and a bit years. Halley's comet sweeps in from an orbit that takes it out to the planet Neptune and back. This little one C/2017 T2 Panstarrs has a little longer journey to make of nearly half a million years. So truly a once In a lifetime look at this cosmic interloper.
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