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Unit 2 Earth Science
Astronomy Part 1
| Term | Definition |
|---|---|
| Astronomy | - the scientific study of the universe |
| Geocentric | - describes the concepts of an Earth centered universe |
| Heliocentric | - descibes the view that the sun is at the center of the solar system |
| Retrograde motion | - the apparent westward motion of the planets with respect to the stars |
| Ellipse | - an oval |
| Astronomical Unit | - the average distance from Earth to the sun |
| Rotation | - the spinning of a body such as earth on its axis |
| Revolution | - the motion of one body about anouther as earth about the sun |
| Precession | - a slow motion of Earthś axis that traces out a cone over a period of 26,000 years |
| Perihelion | - the point in the orbit of a planet where it is closest to the sun |
| Aphelion | - the place in the orbit of a planet where the planetis farthest from the sun |
| Perigree | - the point in which the earth ia closet to the sun |
| Apogee | - the point in which the moon is farthest from the earth |
| Phase of the moon | - the progression of changes in the moons appearance during the month |
| Solar Eclipse | - an eclipse of the sun |
| Lunar Eclipse | - an eclipse of the moon |
| Crater | - the depression at the summit of a volcano or that which is produce by a meteorite impact |
| Terrestrial Planet | - any of the earth like planets |
| Jovian Planet | - the jupiter like planets, relitively low density |
| Nebula | - a cloud of gas and dust in space |
| Planetesimal | - small irregularly shaped body formed by colliding matter |
| Asteriod | - a small rocky body which can range in size from a few hundred kilometers to less than a kilometer |
| Comet | - a small body made of rocky and metallic poeces held together by frozen gases |
| Coma | - the fuzzy, gaseous component of a comets head |
| Meteroid | - a small solid particle that travels through space |
| Meteor | - the luminous phenomenon observed when a meteroid enters Earths atmosphere abd burns up |
| Meteorite | - any portion of a meteoroid that reaches Earths surfaces |
| Electromagnectic Spectrum | - the arrangment of electromagnetic radiation according to wavelength |
| Photon | - a small packet of light energy |
| Spectroscopy | - the study of the properties of light that depends on wavelength |
| Doppler Effect | - the appearence change in frequency of electromagnetic or sound waves caused by the relative motions of the source and the observer |
| Reflectiong Telescope | - a telescope that concentrates light from distant objects by using a concave mirror |
| Refractoring Telescope | - a telescope that uses a lens to bend and concentrate dthe light from distant objects |
| Radio Telescope | - a telescope designed to make observation in radio wavelengths |
| Hubble Telescope | - a space telescope that was launched into low earth orbit in 1990 and is still there |
| Space Shuttle | - a rocket-launched spacecraft used to make repeted journeys between the earth and earths orbit |
Created by:
lindseymravcak
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