Halley's Comet has begun its long trek back toward Earth

Halley's Comet, officially 1P/Halley, has begun its long journey back towards Earth after making it to aphelion – the point in its orbit farthest from the Sun – on December 9. For Halley, that point is so far away, it extends past the orbit of Neptune. The famous comet is slated to sling back by…

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