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Solar system
| Term | Definition |
|---|---|
| Astronomical unit | Used to measure far distances in space |
| Meteoroid | Chunks of rock smaller than asteroid |
| Meteor | Streak of light |
| Meteorite | Meteoroid found on earth |
| Asteroids | Millions of small rocky objects that orbit the sun in the asteroid belt between karts and Jupiter |
| Comets | Made of gas, dust, and ice that revolve around the sun in the kulpier belt and Oort Cloud |
| Inner planets | Terriseral planets Solid and rocky Mercury , Venus, earth , mars |
| Outer planets | Gas giants Made of ice and gas Jupiter, Saturn,Uranus,Neptune Rings and moons Hydrogen and helium |
| Mercury | Closest planet to the sun Not the hottest |
| Venus | Hottest planet Greenhouse effect Day is longer than a year rotation time Acid clouds |
| Earth | Only planet with known life Moderate temperatures Protective atmosphere Liquid water |
| Mars | Largest known mountain Possible signs of life |
| Terrestrial planets | The four inner planets |
| Greenhouse effect | Occurs when a planets atmosphere traps solar energy and causes the temperature to increase |
| Jupiter | Largest planet Great Red Spot |
| Saturn | Most complex ring system Home of a titan moon |
| Uranus | Rotation axis is tilted 90 degrees so it rotates like a bowling ball |
| Neptune | Longest period of rotation |
| Gas giants | Jupiter,Saturn,Uranus,Neptune |
| Galien moons | 4 moons galieo discovered around jupiter |
| Dwarf planet | Pluto was the first Same as planet but not larger than its neighbors Ceres in the asteroid belt |