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When spiral nebulae were first discovered, astronomers quickly identified them as distant groupings of stars.
Q19: When a gas is so dense that
Q20: Which hypothesis suggested that the Moon formed
Q24: What is degenerate matter?
Q31: How often does Venus rotate on its
Q33: What is galactic cannibalism?
Q33: Most of Earth's history has been destroyed
Q45: What is the best description of Hanny's
Q49: The most easily visible supernova remnant is
Q56: A spiral galaxy with an extremely luminous,
Q63: Stars, like our Sun, generate their energy