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Chapter 22 Astronomy

QuestionAnswer
astronomy the science that studies the universe
geocentric the Earth was a sphere that stayed motionless in teh center
orbit the path an object as it goes around another object in space
heliocentric sun centered model
retrograde motion apparent westward drift of planets
astronomical unit the average distance between Earth and the sun
ellipse the oval shape of a planets orbit
rotation turning, or spinning of a body on its axis
revolution the motion of a body along its orbit around some point in space
perihelion when earth is closest to the sun
aphelion earth is furthest from the sun
precession a third and slow movement of the Earth
perigee moon is closest to the earth
apogee moon is furthest from earth
phases of the moon a change in the amount of the moon that appears lit
solar eclipse when the moon moves in line directly between Earth and the sun
lunar eclipse when the moon moves within Earth's shadow
craters round depressions in the surface of the moon
ray splash marks that radiate outward for hundreds of kilometers
rilles long channels associated with maria
lunar regolith soil like layer composed of igneous rock
Astronomy scientific study of the universe.
Geocentric describes the concept of an earth-centered universe.
Retrograde motion the appearent westward motion.
Ellipse, rotation
Revolution
aphelion
perigee
apogee
phases of the mood
Lunar Eclipse
Crater
Mare
Rille
Lunar Regolith
Created by: swood@ph
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