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The universe has been expanding at the same rate since its formation.
Q5: Galaxies contain at most one supermassive black
Q12: All the known matter, both normal
Q13: Vast majority of the known volume of
Q46: Why do almost all active galaxies occur
Q57: How is the geometrical structure of the
Q66: In GUTs, the electromagnetic force and weak
Q90: Galaxies in clusters are much more likely
Q118: The Schwarzschild radius for a 12 solar
Q126: Special relativity says that c, the speed
Q128: From the perspective of an observer in