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What makes the Crab Nebula pulsar unusual among other pulsars?
Q13: Both spiral and elliptical galaxies seem to
Q16: What does it take to allow us
Q49: The presently known laws of physics clearly
Q74: What three properties describe a black hole?
Q86: A protostar of one- half solar mass
Q89: Galactic collisions are believed to be commonplace.
Q103: What can you conclude about a Type
Q103: Our theories of galaxy formation are just
Q140: Of all the active galactic nuclei, the
Q152: Which statement about the Local Group is