Compare the Crab Nebula in two forms of light:
gamma rays and
visible light. The Crab nebula was created by a supernova that
brightened the night sky in 1054 A.D. In 1967, astronomers detected the
remnant core of that star; a pulsar flashing every 0.33 second in radiowaves.
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Goddard Space Flight Center
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Viewing The Violent Universe was created by
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