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celestial object
a single object in space large enough be held together by its own gravity
examples are moons, asteroids, planets, dwarf planets, stars.
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astronomer
a scientist who's main focus is on the space and more specifically celestial bodies
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revolution
when an object circles another object in space due to the second object's gravitational pull.
- for example the Earth revolves around the sun on an annual basis
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rotation
when an object spins on an axis within itself.
for example the earth spins on a axis, that is why we have night and day because the Earth rotates at a speed that exposes a location on the earth to the sun for half of the day and exposes the other half of the earth to the sun while it is night where you are
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