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Stack #4595144
| Question | Answer |
|---|---|
| Astronomical unit | used to measure far distances in space 1 au=distance from earth to sun |
| Meteorite | Chunks of rock smaller than asteroid |
| Asteroid | Millions of small rocky objects that orbit the Sun in the asteroid belt between mars and Jupiter |
| Comets | Made of gas , dust and ice re |
| Inner planets | Terrestrial planets Solid and rocky Mercury Venus earth mars |
| Outer planets | Gas giants Made of gas and ice Jupiter Saturn Uranus Neptune Rings and moons Hydrogen and Helium |
| Mercury | Closest to the sun Not the 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 revolution Acid clouds. |
| Earth | Only planet known to life. Moderate temperatures Protective atmosphere Liquid water. |
| Mars | Largest known mountain-Olympus mons Possible sings 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 planet it would float Home of titan a 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, and Neptune Nick name for the 4 outer planets |
| Galilean moons | 4 moons Galileo discovered around Jupiter Io Europa Ganymede Callisto |
| Dwarf planet | Pluto was the first Same size but not bigger than the things around it |