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Solar system
| Question | Answer |
|---|---|
| Astronomical unit | Used to measure far distances in space 1AU= Distance from earth to sun |
| Meteoroid | Chunk of rock smaller than asteroid |
| Meteor | Streak of light |
| Meteorite | Space rock found on earth |
| Asteroids | Million of small rocky objects that orbit the sun in the asteroids belt between mars and Jupiter |
| Comets | Made of gas,dust,and ice, revolve around the sun in the Kuiper Belt and ocrt cloud |
| Inner planets | Terrestrial 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-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 |
| Earth | Only planet with known life Moderate temperature Protective atmosphere Liquid water |
| Mars | Largest known mountain-Olympus mons Possible signs of life |
| Terrestrial planets | The four lnner planets |
| Greenhouse effect | Occurs when a planet’s 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 Titan-largest moon |
| Uranus | Rotation axis is tilted 90 degrees so rotation like a bowling ball |
| Neptune | Longest period of Revolution Swirling storms-windiest planet |
| Gas giants | Jupiter, Saturn, Uranus |
| Galilean moons | 4 moons galileo discovered around Jupiter Lo, Europa, Ganymede, Callisto |
| Dwarf planet | Pluto |