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Expl. Space Part 4
Mr. Waddell's Astronomy Unit
| Question | Answer |
|---|---|
| __________ and motion are the key forces behind the creation of planets and other bodies within the Solar System. | gravity |
| A ____________________ is a star and everything that orbits it. | solar system |
| This is the belief that the Earth is the center of the universe. | geocentrism |
| This is the belief that the Sun is the center of the universe. | heliocentrism |
| This is a round object of significant mass and volume, with regular paths of revolution around a star. | planet |
| This is the period it takes a planetary body to make a complete spin on its axis (a.x.a. day). | rotation |
| This is the period it takes a planetary body to completely travel around a star (a.k.a. year). | revolution |
| This term refers to small, dense rocky planets. | terrestrial |
| This is another term for a gas-giant planet. | jovian |
| This is a relatively small, dense rocky object with no defined shape. A band of these exist between Mars and Jupiter. | asteroid |
| This is a ball of ice and debris with eccentric orbits that travel from the exterior to the interior of the Solar System. | comet |
| This is an extremely small piece of debris that float freely within the Solar System. | meteor |
| This is a very small planet (fitting most conditions of a planet’s definition), often found beyond the orbit of Neptune. | dwarf planet |
| This region is believed to be the home of comets. | oort cloud |
| This region beyond Neptune is the home of many dwarf planets. | kuiper belt |
| This term refers to any object that orbits another. | satellite |
| This Moon phase occurs when the Moon is directly between the Earth and the Sun. | new moon |
| This Moon phase occurs when the Moon is at its farthest away from the Sun. | full moon |
| This term refers to a Moon with more than 50% of its observed surface lit. | gibbous |
| This term refers to a Moon with less than 50% of its observed surface lit. | crescent |
| This term refers to the period of the Moon when the observed lit portion is progressively getting larger. | waxing |
| This term refers to the period of the Moon when the observed lit portion is progressively getting smaller. | waning |
| This effect occurs when the gravity of the Moon causes the Earth to bulge. | tidal effect |
| This occurs when the Moon’s path is directly between the Earth and the Sun so that the Moon casts a direct shadow onto the Earth | solar eclipse |
| This occurs when the Earth’s path is directly between the Sun and the Moon so that the Earth casts a shadow over the entirety of the Moon. | lunar eclipse |
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