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unit three
| Question | answer |
|---|---|
| solar system | The planets and all bodies that orbit a star |
| heliocentric | Where the sun is in the middle of the solar system |
| geocentric | Where the earth is in the middle of the solar system |
| parralax | the apparent shift of an object as viewed in different position |
| gravity | A force of attraction between objects that is due to mass |
| orbit | The path a body travels around another body |
| aphelian | in the orbit of a planet or other body in the solar system at the point farthest from the sun |
| perilhelio | The point in the orbit of a planet that is closet to the sun |
| centripetal force | the inward force that is required to keeps particles or an object in a circular |
| solar nebula | a rotating cloud of gas and dust from which the sun and planet form |
| nuclear fusion | the process by which small and light nuclie combine to form a new more massive nuclie the process releases energy |
| planitismal | the small bodies that turned into planets at the early stages |
| sunspot | A dark are of a photosphere |
| solar flare | an explosive release of energy that comes from the sun and is associated with magnetic disturbance on the suns surface |
| prominence | A loop of gas that extends from the photosphere |
| terrestrial planet | Dense planets closets to the sun |
| astronomical unit | the distance between the earth and sun about 150 km |
| gas giant | A planet with a thick atmosphere |
| planetary ring | a disk of matter that incuircles a planet particles like rock dust and ice |
| dwarf planet | A celestial body that orbits the sun but is to small to clear its area |
| kuipler belt | A region beyond Neptune that contains small bodies such as ice |
| kuipler belt object | hundreds to thousands of minor planet sized that orbit the sun in a flat belt beyond Neptune's orbit |
| comet | A small body that gives off dust,and ice in a tail |
| oort cloud | A spherical area from the kuipler belt to around halfway to the nearest star comprised of billions of objects |
| asteroid | A small rocky object that orbits the sun most are between Mars and Jupiter |
| Meteoroid | small rocky body that orbits the sun |
| metor | a Meteoroid that hit Earth atmosphere |
| meteorite | A metor that hit Earth's surface |
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