What are the main reasons for the theory of the interstellar origin of comets?

The direction of the Sun’s motion to the apex relative to the nearest stars turns out to be close to the orbital planes of long-period comets. The sun, moving in space in the direction of the constellations Lyra and Hercules, meets the nuclei of comets of interstellar origin. The comets are then captured by the Sun and become periodic objects. The chemical composition of comet matter is close to the composition of interstellar dust clouds.

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