Venus and Mercury Vocabulary-
1. Planet- An
object moving around a star.
2. Orbit- The
path one object takes around another.
3. Revolution- When
something is moving in a circle around another object
4. Rotation- When
an object spins it is said to be rotating.
5. Satellites- A
small object orbiting a larger one.
6. Axis- An
imaginary straight line on which an object rotates.
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