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Unit 2 Astronomy P1
| Term | Definition |
|---|---|
| astronomy | the science that deals with the material universe beyond the earths atmosphere |
| geocentric | |
| heliocentric | measured or considered as being seen from the center of the sun |
| ellipse | geometric |
| astronomical unit (AU) | a unit of length, equal to the mean distanceof the earth from the sun |
| rotation | turning or spining on an axis |
| revolution | the orbiting of one heavenly body around another |
| perihelion | the point in the orbit of a planet or comet at which it is NEAREST to the sun |
| aphelion | the point in the orbit of a planet or comet at which it is FARTHEST from the sun |
| phases of the moon | |
| solar eclipse | the obstruction of the light of the SUN by the intervention of the moon between it and the earth |
| lunar eclipse | the obstruction of the light of the MOON by the intervention of the earth between it and the sun |
| terrestrial planet | inner planets- smaller planets that are closest to the sun |
| jovian planet | any of the four large planets; Jupiter, Saturn, Uranus, and Neptune |
| asteroid | a piece of rock mostly found in the astroid belt between orbits of Mars and Jupiter |
| comet | space object made of dust and rock particles that forms a bright coma as it approaches the sun |
| meteoroid | any of the small bodies, often remenants of comets, traveling through space |
| meteor | a meteoroid that has entered the earths atmosphere |
| meteorite | a mass of stone or metal that has reached the earth from outer space |
| electronmagmetic spectrum | the complete range of electromagnetic radiation from the longest waves to the shortest waves |
| photon | a quantum of electromagnetic radiation, usually considered as an elementry particle that is its own antiparticleand |
| doppler effect | a change in frequency of electromagnetic radiation. the shift is to higher frequencieswhen the source approachesand to lower frequencies when it recedes. |
| refracting telescope | uses convex lenses |
| reflecting telescope | uses a cocave mirror to direct light from the base of the telescope back toward the eyepiece lens |
| radio telescope | uses radiowaves to create images |
| hubble telescope | reflecting space telescope (built in 1990) |
| space shuttle | reuseable spacecraft that can carry cargo, astronauts, ans satelites to and from space |
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