3I/ATLAS is a very interesting object. It's the size of Manhattan. It's not mostly ice and grit like most comets, but instead has a high metal content. Not only that, but it's moving extremely fast too; at 61 km/s it is the fastest interstellar object ever recorded. It's emitting its own light source. And instead of just having a tail behind it, like a comet, it has a tail in FRONT of it. It is going to pass through our system and then off into interstellar space on its the current trajectory, never to be seen again.

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