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The Solar System Study Guide
1. The solar system is made of the Sun and its eight planets along with many dwarf planets, moons,
asteroids, and comets
2. The known planets in the solar system are: Mercury, Venus, Earth , Mars, Jupiter, Saturn ,
Uranus, Neptune and what was once known as Pluto is now a dwarf planet.
3. A full movement is called a revolution.
4. Gravity keeps the moon orbiting around Earth
5. The earth spins around an imaginary line called an axis
6. The Earth completes one rotation, or one day in 24 hours.
7. Mercury is a small rocky planet with many craters on its surface it is the closest planet to the sun
8. Venus is the second planet from the sun and is covered by clouds of water vapor a sulphuric
acid.
9. Earth is the Third planet from the sun. It is the only planet to have water on its surface, it is the
only planet that has life.
10. Mars is the fourth planet from the sun, it is known as the Red Planet.
11. Jupiter is the fifth planet from the sun and is the stormiest planet in our solar system and has a
whirlpool of permanent storms.
12. Saturn is the sixth planet from the sun; it is surrounded by rings, and has at least 18 moons.
13. Uranus is the seventh planet from the sun; it is the smallest of the gas planets. Uranus contains
a frozen mass of methane and ammonia, and has 27 moons.
14. Neptune is the eighth planet from the sun; it is a gas giant. Neptune is composed of hydrogen
and helium and contains 13 moons.
15. A comet is a frozen mass of different types of ice and dust orbiting the sun.
16. An asteroid is a rocky mass up to several hundred kilometers wide that revolves around the sun.
17. The moon is the Earths only natural satellite.
18. Moon phases are the shapes of the lit side of the moon we can see.
19. A lunar month is when the moon changes from thin crescent to a full moon and back again to a
crescent in 29 days.
20. The five different types of stars are the red dwarf star, yellow star, blue giant stars, giant star,
and super giant star.
21. Moon phases