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Unit 1 vocab, part 1
Astronomy
| Term | Definition |
|---|---|
| Astronomy | Celestial objects, space, and the physical universe as a whole. |
| Geocentric | Center of the earth. |
| Helocentric | Center of the sun. |
| Retrograde motion | Motion of a planet. |
| Ellipse | A regular oval shape. |
| Astronomical Unit (AU) | Unit of measure equal to 149.6 million kilometers, the mean distance from the center of the earth to the center of the sun. |
| Rotation | The action of rotating around an axis or center. |
| Revolution | An instance of revolving, turning. |
| Precession | The slow movement of the axis of a spinning body around another axis, due to a gravitational movement. |
| Perihelion | The point in the orbit of a planet, asteroid, or comet at which it is closest to the sun. |
| Aphelion | The point in the orbit of a planet, asteroid, or comet at which it is furthest from the sun. |
| Perigree | The point in the orbit of a planet, asteroid, or comet at which it is furthest from the sun. |
| Apogee | The point in the orbit of the moon or a satellite at which it is furthest from the earth. |
| Phases of the Moon | How much of the moon is illuminated. |
| Solar Eclipse | An eclipse in which the sun is covered by the moon. |
| Lunar Eclipse | An eclipse in which the moon appears darkened as it passes into the earth's shadow. |
| Crater | a large, bowl-shaped cavity in the ground or on the surface of a planet or the moon, typically one caused by an explosion or the impact of a meteorite or other celestial body. |
| Terrestrial Planet | A planet composed of mostly rocks. |
| Jovian Planet | Any of the four outermost planets of the solar system. |
| Nebula | A cloud of dust or gas in outer space. |
| Planetesimal | an object formed from dust, rock, and other materials |
| Asteriod | A small rocky body orbiting the sun. |
| Comet | Icy small solar system. |
| Coma | The nebulous envelope around the nucleus of a comet. |
| Meteroid | A piece of stone-like or metal-like debris which travels in outer space. |
| Meteor | Matter from outer space that enters the earth's atmosphere |
| Meteroite | A meteor that survives the earths atmosphere such as part of it strikes the ground. |
| Electromagnetic Spectrum | The range of wavelengths or frequencies over which electromagnetic radiation extends. |
| Photon | A particle representing a quantum of light or other electromagnetic radiation. |
| Spectroscopy | The investigation and measurement of spectra produced when matter interacts with or emits electromagnetic radiation. |
| Doppler Effect | An increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move toward (or away from) each other |
| Refracting Telescope | A telescope that uses a converging lens to collect light. |
| Reflecting Telescope | A telescope in which a mirror is used to collect and focus light. |
| Radio Telescope | An instrument used to detect radio emissions from the sky, whether from natural celestial objects or from artificial satellites. |
| Hubble Telescope | Space telescope that was launched into low Earth orbit in 1990, and remains in operation. |
| Space Shuttle | A rocket-launched spacecraft, able to land like an unpowered aircraft, used to make repeated journeys between the earth and earth orbit |
Created by:
madisonellis21
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