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If the Sun were to magically and instantaneously be replaced by a 1 solar mass black hole, what would happen to the Earth's orbit?
Q5: Why can one not use quasars to
Q7: The radio source _ is located in
Q8: What explanation does general relativity provide for
Q11: Most stars in the Milky Way probably
Q19: Star A and star B both have
Q31: An alternative to the core-accretion theory that
Q42: How is proper motion measured?
Q47: Giant elliptical galaxies may be the result
Q51: Our solar system is in the Galactic
Q59: In the United States, _ is highly