On the largest scale, the general tendency is for galaxies to move away from one another. In other words, the Universe is expanding.
Stars, Planets, nebulae, galaxies.
motion
no
it is the pl anets galaxy sun moon
Stars and galaxies in the universe are moving away from one another in a manner similar to the way in which raisins in a ball of dough are moving away from one another.
The heavenly bodies on the universe are anything that is found in the skies and is placed there by nature. Some of the common heavenly bodies include comets and stars.
Other galaxies are moving away because the universe is expanding, but we are not at the centre of the universe.
There are no perfect black bodies on the universe. But there are a lot of them which can be approximated (with good precision) by the black body description.
Sure; the celestial bodies are an important part of the Universe.
It is gravity.
No. Pretty much everything in the Universe is moving away from pretty much everything else in the Universe. This is because the Universe is expanding.
It is good. None of the bodies in the universe would have formed without gravitation and so there would probably be a universe full of atomic particles moving around. Galaxies, stars and planetary systems would never have evolved from the cosmic dust without gravity.
astronomy
All bodies in the Solar System do, but outside of that - the Universe - have their own time frame.
While there is some seemingly random movement, in general the objects are moving away from one another. In other words, the Universe is expanding.
Aristotle's model of the universe took into account the charted movements of the heavenly bodies, but was complicated by the assumption that Earth lay at the center of the universe.
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