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Astronomy Vocab1

TermDefinition
Astronomy the branch of science that deals with celestial objects, space, and the physical universe as a whole
Geocentric having or representing the earth as the center, as in former astronomical systems
Heliocentric having or representing the sun as the center, as in the accepted astronomical model of the solar system
Ellipse a regular oval shape
Astronomical Unit(AU) a unit of measurement 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 the movement af an object around something
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
Phases of the Moon the shape of the illuminated portion of the Moon as seen by an observer on Earth
Solar Eclipse an eclipse in which the sun is obscured by the moon
Lunar Eclipse an eclipse in which the moon appears darkened as it passes into the earth's shadow
Terrestrial Planet a planet that is composed primarily of silicate rocks or metals
Jovian Planet gas giant planets including Jupiter, Saturn, Uranus, and Neptune
Asteroid a small rocky body orbiting the sun
Comet a celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun
Meteoroid a small body moving in the solar system that would become a meteor if it entered the earth's atmosphere
Meteor a small body of matter from outer space that enters the earth's atmosphere, becoming incandescent as a result of friction and appearing as a streak of light
Meteorite a meteor that survives its passage through the earth's atmosphere such that 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
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 The Hubble Space Telescope is a large telescope in space. NASA launched Hubble in 1990. Hubble is as long as a large school bus.
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: 3169733
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