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Our Solar System

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1.
1 point
The International Astronomical Union (IAU) made a decision that to be a planet in our solar system three circumstances must be evident. Which of the following is NOT one of the circumstances?
2.
1 point
The planets of our solar system can be divided up in to two groups: the ____ and ____ planets.
3.
1 point
In the sixteenth century Greek scientists thought the planets, the stars, the Moon and the Sun, traveled around Earth. This is called the ________ model of the solar system.
4.
1 point
The most accepted theory for how the Solar System formed is known as the ______ Theory.
5.
1 point
In the early 1600s, Johannes Kepler discovered that the orbits of the planets are oval shaped, or ______, with the Sun’s position off-center.
6.
1 point
This object contains 99.86% of all the matter in the Solar System.
7.
1 point
Planets closer to the Sun travel faster than planets farther away from the Sun.
8.
1 point
In 1543, Nicholas Copernicus published his model of the solar system, stating that Earth and the other planets revolved around the Sun. This is what we call a(n) ______ model of our Solar System.
9.
1 point
Ceres, Eris, and Pluto are known as ______.
10.
1 point
How many planets are there in our Solar System?
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