WHAT IS A COMET?
Belts of comets, which apparently exist beyond the orbit of Pluto, are the same as the rings of the giant planets - frozen atmosphere of the Sun. The ice blocks of different sizes.
As meteorites can knock out of rings the individual chunks of ice, and larger celestial bodies (asteroids) can knock out the ice blocks from the belts of comets. A block can be knocked out at the collision in the direction of the Sun. The sun begins to attract it. So there arises a comet.
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