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How do comets leave the Oort cloud

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Final answer:

Comets leave the Oort cloud when they are diverted into the inner solar system due to the gravity of nearby stars.

Step-by-step explanation:

Comets leave the Oort cloud when they are diverted into the inner solar system. The Oort cloud is a spherical collection of ancient icy objects that surrounds the Sun out to about 50,000 AU. It is believed that the gravity of nearby stars can disturb the orbit of a comet in the Oort cloud, causing it to move closer to the Sun and become visible to us.

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