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The lunar highlands appear brighter than the mare, because these highlands are due to meteor impact that completely avoided the mare.
Q16: Contrast the orbits of comets and asteroids.
Q23: Saturn's rings are thick, perhaps a few
Q40: Radio waves, visible light, and X- rays
Q40: Methane absorbs red light readily, so we
Q42: Relate sunspots and prominences.
Q43: Describe the interaction between Jupiter and Comet
Q92: Optical telescopes are usually used only at
Q93: An emission line results from an electron
Q104: The surface of Io looks most like
Q111: When plates collide, they fuse together and