because meteor and etc. move across the sky so that gravity can't get to them.
No. They do not have enough gravity to hold on to the gasses.
Superstitions about asteroids, comets, and meteors have absolutely no scientific basis whatsoever.
Comets
The universe
Comets contain ice.
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No, comets and meteors are not considered to be small planets. Comets are simply considered to be comets, and meteors are simply considered to be meteors. (Meteors are asteroids that have entered the atmosphere.)
No. They are in space.
Comets a planet like object going around the sun in larger elliptical orbit with greater period of revolution, asteroids are broken pieces of some planets, meteors are due to the passage of such broken pieces through atmosphere of earth due to gravity pull.
Many comets and many asteroids are named, though not all, particulary not all asteroids. As for meteors, as they happen in an instant when a piece of ice, dust, dirt or rock enters the Earth's atmosphere and burns up and then they are gone, they are not named.
Because they do not have volatiles in them to form a coma as to comets.
Asteroids, comets, and meteors fall suddenly towards Earth due to gravitational forces. When they come within range of Earth's gravity, they are pulled in, causing them to fall towards the planet at high speeds. Additionally, factors like orbital dynamics and collisions in space can also contribute to their sudden approach.