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Unit 2 Astronomy P1

TermDefinition
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
Created by: 3082817