What function does asteroids, comets and meteoroids serve in the solar system?

They don't have any function, they are just left over debris from the dust cloud that preceded the formation of the major planets.

<QUOTE>What function does asteroids, comets and meteoroids serve in the solar system?</QUOTE>

The same function as the rocks at the side of the road which you don't notice when you walk past them.

<QUOTE>These celestial objects bombard the sun, moons, and the planets, so is there a reason why they do this?</QUOTE>

Celestial objects don't have a will of their own. If they "bombard" the Sun, moons and planets, it's because the objects were attempting to occupy the same place at the same time. Just like when you fall on the ground when not holding onto something.

<QUOTE>do they do anything or something for the earth?</QUOTE>

Since meteors come in at large velocities, they meet friction with the atmosphere and heat up. Thus, you're locally heating up the atmosphere around the entry path. But given that the atmosphere is so more massive than the incoming objects, its effect is hardly noticeable (unless they're sufficiently large).

If you learnt how to calculate the kinetic energy of an object at school, then you have all you need to calculate the total energy released. Consider a typical velocity of 30 kilometers per second, assume that the meteor has about from 1 to 8 times the density of water, and pick a size to calculate the mass. Try different sizes and see how much kinetic energy they're carrying; that's how much energy is released on reentry and collision.

<QUOTE>There is a reason for everything!</QUOTE>

If "Just because it's there" counts as a reason to you, then sure.

each and every of the planets and asteroids holiday around the sunlight. a great sort of the comets do additionally. an somewhat few comets are "one time" travelers, in simple terms passing by way of our photograph voltaic device. For the comets that do orbit the sunlight, a pair of million/2 orbit in retrograde orbits (clockwise). each and every thing else travels interior the the comparable direction: counter-clockwise around the sunlight (as seen from far above the North pole). yet all of them have distinctive speeds and paths.

masses in this Cosmos create gravitational fields. In order to attain gravitational equilibrium, they move towards minimum energy. If the energy is quantized, they move in specific orbits like electrons

There are no reasons, there are effects sure, but reasons? no. it happens because the conditions necessary for them to happen are present. it's primitive thinking to conclude that things happen for a reason.

These are questions that science has not yet been able to answer, so the answer is: no one knows.