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Comets have a different composition to other inner solar system bodies, and asteroids, and also wildly eccentric deep-space orbits. So they must have a different origin to the rest of the inner solar system. But what is that origin, and what brings comets in towards the inner solar system so we can see them?
David, your inventive explanation does not match current thinking.
While there is still a great deal to be learned about comets the view is that they are a product of the same processes which produced the rest of the solar system.
... CliffordK noted the important fact that they contain CAIs.
Is there any specific part of what I said which you take issue with and which is actually wrong?
Might some of them have come from beyond the solar system? Almost certainly, but this would be a very tiny minority.