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Q23: During a total lunar eclipse, which of
Q25: The Sun has a surface temperature of
Q27: A _ has a few million light-sensitive
Q45: If you were standing on the Earth's
Q68: The number of _ in the nucleus
Q72: The least massive main-sequence stars have a/an
Q108: A(n) _ is a circle whose center
Q113: A lunar eclipse that occurs when the
Q145: Why were telescopes with very large, thin
Q164: Compared with the spectral lines in the