comet have no light own, how are we able to see them?
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The Equator is another of the Earth's great circles. If you were to cut into the Earth right on its Equator, you'd have two equal halves: the Northern and Southern Hemispheres. The Equator is the only east-west line that is a greatcircle. All other parallels (lines of latitude) get smaller as you get near the poles.
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