1. SOLAR SYSTEM  Comets  Asteroids  Meteors  Moons  Planets  Sun Remember CAMMPS All objects in our solar system revolve around the sun because it has the strongest gravitational pull.

2. Sun Average-sized star Diameter 870,000 miles Mostly made of hydrogen gas Contains 99% of all material in the solar system Temp. range from 1 million °F inside core to 10,000°F at surface

3. Mercury Revolution Time: 88 days Rotation Time: 59 days Planet closest to the sun Greatest temperature difference from day to night Very thin atmosphere Covered with craters No moons, No rings

4. Venus Revolution Time: 225 days Rotation Time: 243 days Earth’s sister planet – similar size and surface No moons, No rings Very thick atmosphere of carbon dioxide and clouds of sulfur Hottest planet because of global warming gases (greenhouse effect)

5. Earth Only planet with liquid water Atmosphere of 78% nitrogen and 21% oxygen One moon, No rings Rotation – 24 hours Revolution time – 365 days

6. Mars Revolution Time – 687 days Rotation Time – 24 hrs 40 min 2 moons, No rings Atmosphere of carbon dioxide Red color from iron oxide(rust) in the soil Largest volcano – Olympus Mons

7. Jupiter Revolution time – 11.9 Earth years Rotation time – 9 hrs 55 min 50+ moons, faint rings Biggest planet Made of gas, no solid surface Great Red Spot, a hurricane-like storm on the surface Atmosphere of hydrogen and helium

8. Saturn Revolution time – 29 ½ yrs Rotation time – 10 hrs 40 min 53 moons Most known for its rings Rings made of rocks and dust Atmosphere of hydrogen and helium Would float in water

9. Uranus Revolution time – 84 years Rotation time – 17.3 hours Bluish green in color 11 Rings 27 moons Rotates on its side No solid surface Atmosphere – 84% hydrogen

10. Neptune Revolution time – 165 years Rotation time – 16 hours Fastest winds Faint rings 13 moons Blue color from methane in atmosphere Two dark storms on surface – Great Dark Spot and Scooter

11. Pluto Revolution Time – 248 years Rotation Time – 6 days 9 hours 3 moons Switches orbit with Neptune for 20 years of its revolution Now considered a “dwarf planet” Atmosphere of nitrogen and methane

12. http://pds.jpl.nasa.gov/planets/welcome.htm Saturn is the only planet that can float in water!!!