The answer to this question is quite difficult, and astrophysicists are trying to figure it out as we write, but so far it seems to us that nothing in the universe remains static and we have yet to find the prime building block of matter.
However, humans categorize many things to try to keep track of, or make sense out of the natural world. The universe is no exception and there are thousands of names/titles to various entities.
A very basic list follows:
Asteroids
Comets
Moons
Planets
Stars
Solar systems
Galaxies.
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