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Q2: Supernovae are the main source of _
Q3: Pythagoras proposed that all nature was underlain
Q8: As a star like the Sun exhausts
Q23: What property of a Cepheid variable can
Q24: Due to the cycle of precession, in
Q27: Most of the light that makes the
Q30: The resistance of matter to changes in
Q41: Two objects in orbit around each other
Q58: O and B stars are important spiral
Q72: The Kelvin temperature scale is based on