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Comet Tsuchinshan-ATLAS is a Halloween visitor from the spooky Oort Cloud – the invisible bubble that is home to countless space objects

The human mind can have a hard time conceptualizing this: a cosmic cloud so colossal that it encircles the sun and eight planets while stretching trillions of miles deep into space.

The spherical shell known as the Oort cloud is invisible for all practical purposes. The particles that make it up are so thinly dispersed and so far away from the light of any star, including the Sun, that astronomers simply cannot see the cloud, even though it envelops us like a blanket.

It is also theoretical. Astronomers conclude that the Oort cloud is there because it is the only ...

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