Oort-cloud comets are so far from the Sun that the gravity of neighboring stars can alter their orbits.

Name: Oort-cloud comets are so far from the Sun that the gravity of neighboring stars can alter their orbits.
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The Oort Cloud is believed to be located about 1 light-year away from the Sun, and it is so far out that the gravity of neighboring stars can influence the orbits of its comets. These comets can be perturbed from their original orbits and be sent towards the inner solar system.

Oort-Cloud Comets Are So Far from the Sun That the Gravity