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PHYS 162 Elementary Astronomy - page 19 / 29

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PHYS 162 Class 2

PHYS 162 Class 2

Stars and Planets

Stars are “fixed” relative to each other. They produce their own light which is independent of Sun’s location (thus indicating they are very far away - the Greeks understood this)

Planets have complicated (but predictable) orbits when viewed from the Earth. Wanderers. Brightness does depend on Sun. Small numbers of such objects (5 planets visible to unaided eye)

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