click below
click below
Normal Size Small Size show me how
Solar System
| Term | Definition |
|---|---|
| Astronomical Unit | Used to measure far distances in space 1 AU=Distance from earth to sun |
| Meteoroid | Chunk of rock smaller than asteroid |
| Meteor | Streak of light |
| Meteorite | Space rock found on earth |
| Asteroids | Millions of small rocky objects that orbit the Sun in the asteroid belt between mars and Jupiter |
| Comets | Made if gas dust and ice revolve around the sun in the juicer belt and Oort Cloud |
| Inner planets | Terrestrial 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 |
| Planet | Spherical, orbits the Sun, clears its orbit |
| Mercury | Closest planet to the sun NOT THE HOTTEST- so small it lacks gravity and atmosphere |
| Venus | Hottest planet Greenhouse effect Day is longer than a year- rotation time is longer than it’s revolution Acid clouds |
| Mercury and venus | DON’T HAVE ANY MOONS |
| Earth | Only planet with known life Moderate temperatures Protective atmosphere Liquid water |
| Mars | Largest known mountain- Olympus Mons 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 Galilean moons Great red spot |
| Saturn | Most complex ring system Least dense planets- it would float Titian-largest moon |
| Uranus | Rotation axis is tilted 90 degrees so rotates like a bowling ball |
| Neptune | Longest period of revolution Swirling storms-windiest planet |
| Gas giants | Jupiter, Saturn, Uranus, Neptune Nickname for the 4 outer planets |
| Galilean moons | 4 moons Galileo discovered around Jupiter -Io, Europa, Ganymede, Callisto |
| Dwarf planet | Pluto was the first Same as planet but not larger than its neighbors Ceres in the asteroid belt |