Comet A3 hasn't been past Earth since the Neanderthals. Your last chance to see it is approaching fast. Here's where and how to spot it.

Comets develop the spectacular long tails that they are known for by approaching the Sun. When they get too close, their icy volatile materials begin to sublimate away, carrying along clouds of dust.

Timelapse video captured on 12 October by the Subaru Telescope at the Mauna Kea Observatory in Hawaii shows the Tschinshan-ATLAS comet passing by Earth. A special live stream was launched from the ...