| Term | Definition |
|---|
| probe | unmanned mission into space |
| Saturn V | Largest rocket ever built, Apollo Rocket |
| Law of Universal Gravitation | Newton, any two bodies are attracted to each other with a force related to their mass |
| Terrestrial Planets | Inner planets, rocky surfaces |
| Mercury | 1st planet, no moons, small, extreme temperatures |
| Venus | Earth's twin, 2nd planet sulfuric acid clouds, Highest Temperature |
| Earth | 3rd planet, water in all 3 states |
| Moon | orbits Earth |
| maria | dark parts of Moon, made of basalt |
| highlands | light parts of Moon |
| regolith | loose dark powdery rocks on Moon |
| Mars | 4th planet, iron in soil |
| Phobos | moon of Mars |
| Deimos | moon of Mars, smallest in Solar System |
| Asteroid | small rock that orbits the sun, most between Mars and Jupiter |
| Meteoroid | asteroid that leaves orbit and is moving toward a planet |
| Meteor | Meteoroid that burns up in a planet's atmosphere |
| meteorite | meteor that lands on planets surface |
| planet | orbits Sun, has gravity, "cleared the neighborhood" |
| Jupiter | Largest Planet, Great Red Spot, Shortest Day in Solar System |
| Olympus Mons | shield volcano on Mars, largest in Solar System |
| Saturn | 6th planet, lowest density, lots of rings |
| Uranus | 7th planet, blue, methane atmosphere, tilted |
| Neptune | 8th planet, blue, methane in atmosphere |
| constellations | group of stars that forms a a pattern, used to navigate |
| comet | small icy object that orbits the Sun |
| coma | head of a comet, brightest part |
| tail | end of a comet, always points away form the Sun |
| Sun | closest star, halfway through its life cycle |
| photosphere | layer of atmosphere of Sun, most light created here |
| Chromosphere | layer of Sun's atmosphere, above photosphere |
| Corona | outer layer of sun, largest part of its atmosphere |
| sunspots | colder, darker areas of the Sun |
| galaxy | group of stars, gases and dust held together by gravity |
| Ganymeade | Moon of Jupiter, largest in Solar System |
| Milky Way | Our home Galaxy |
| Big Bang Theory | Theory that the Universe began in one tiny spot and exploded from there |
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