A Few Thousand Comets with Perihelia Very Close to the Sun

question 122

Multiple Choice

A few thousand comets with perihelia very close to the Sun have been observed. These originate from

• A) the breakup of a single comet, so these comets all have very nearly the same orbit.
• B) gravitational disturbances of the Oort cloud by a nearby star.
• C) gravitational disturbances of the Kuiper belt by Jupiter.
• D) gravitational disturbances of the Kuiper belt caused by resonances between Neptune and Kuiper belt objects.

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