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Physical Science Quiz 2

Across
How objects appear to move in the sky based on the position of the observer.
Our solar system contains __________ planets.
Planets don't orbit in a circle, they orbit in a(n) _____________.
A natural satellite that orbits something in space that is not a star.
This model is the correct way to describe our current understanding of the organization of the solar system (3 words).
How many planets in the solar system are made up of mostly gasses?
The model that says that the sun is the center of your solar system.
The model of the solar system that says that earth is the center and everything else orbits.
______________ limits the size of mountains and living things on earth.
Down
Water exists on other planets, but scientists believe life has been discovered only on earth because the water here is ____________.
We only ever see one side of the moon because earth's moon ____________________________ at the same speed (3 words).
The terrestrial planet that is farthest from the sun.
How objects actually move regardless of how it looks from the perspective of the observer.
This scientist came up with three laws to explain planetary motion (last name only).
An invisible force that pulls objects towards each other
In general, what condition on the planets is most affected by its distance from the sun?
The largest planet in the solar system.
The hottest planet in the solar system.
How many planets in the solar system have rings?
The smallest planet in the solar system.