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Binary stars can evolve to become novae and supernovae because small differences in the stars' masses can mean large differences in their main-sequence lifetimes.
Q20: Nuclei of atoms are held together by
Q36: Molecular clouds, which have temperatures of around
Q51: Parallax is used to measure a star's:<br>A)
Q56: Which of the following are generally NOT
Q65: Consider a small comet nucleus, whose diameter
Q68: The presence of dwarf galaxies around the
Q69: The unified model of AGN suggests that
Q76: Seyfert galaxies are unique because they have
Q85: If you measure the velocity of a
Q88: The Sun exhibits differential rotation. Explain what