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The average distance between Earth and the Sun is called a "light-year."
Q15: Is there scientific debate over whether or
Q38: The theory of everything (TOE)would provide one
Q50: What solution has been proposed by cosmologists
Q58: Why is Jupiter's moon,Io,so volcanically active?
Q66: The final stages of the formation of
Q95: What are characteristics of terrestrial planets?
Q100: The idea that the Sun and planets
Q106: Evidence of volcanism (lava outflow,etc. ),either active
Q122: The center,or fixed point,of the Greek model
Q125: The spacecraft that successfully photographed Uranus on