FIND HERE SOME QUESTIONS TO PRACTICE BEFORE THE TEST! DON`T PANIC!

UNIT 1
1.-Calculate the distances between the following planets:(Distance Sun - Mars= 3.2AU; distance Sun-Uranus= 26 AU;
 distance Sun - Mercury= 0.7)
a.- The Earth and Mars:
b.- Mercury and Uranus:
2.-Which planet doesn't follow the same pattern when revolving?: (choose one)
a.- Mars
b.- Neptune
c.- Uranus
3.-What is a star? Compare a planet and a star.
4.-Give four evidences to support the Heliocentric Model:
5.-Why does the Earth orbit the Sun?
6.-Why is the Sun the center of the Solar System?
7.- How old is the Sun?
8.- Why are the planets in their orbits?
9.- How far are the Sun and the Earth?
10.- Calculate the distance between the Earth and Neptune knowing that Neptune is 24 AU away from the Sun. Give the answer in AU  and in Km.
11.- Which planet or planets rotate anticlockwise?
12.- Which planet or planets rotate clockwise?
13.- Which planet lies on its orbit?
14.- Which planet is the most dense?
15.- Which planet is the least dense?
16.- Compare the inner and the outer planets.
17.- Explain the consequences of the Earth’s rotation.
18.- Explain the consequences of the Earth’s revolution.