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17 Cards in this Set
- Front
- Back
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black hole
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A mass that has collapsed to such a small volume that its gravity prevents the escape of all radiation. Also, the volume of space from which radiation may not escape. (p. 240)
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collapsar
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A star of high mass that collapses into a black hole. A possible source of gamma-ray bursts. (p. 247)
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event horizon
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The boundary of the region of a black hole from which no radiation may escape. No event that occurs within the event horizon is visible to a distant observer. (p. 242)
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gamma-ray burster
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An object very faint at visual wavelengths that produces a sudden, powerful burst of gamma rays. (p. 246)
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gravitational radiation
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Disturbances in a gravitational field traveling at the velocity of light and carrying energy away from an object with a rapidly changing mass distribution. (p. 236)
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gravitational redshift
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The lengthening of the wavelength of a photon due to its escape from a gravitational field. (p. 243)
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hypernova
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Produced when a very massive star collapses into a black hole. Thought to be a possible source of gamma-ray bursts. (p. 247)
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magnetar
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A class of neutron star having very strong magnetic fields. (p. 247)
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millisecond pulsar
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A pulsar with a pulse period of only a few milliseconds. (p. 238)
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neutron star
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A small, highly dense star composed almost entirely of tightly packed neutrons. Radius about 10 km. (p. 230)
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pulsar
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A source of short, precisely timed radio bursts. Believed to be spinning neutron stars. (p. 231)
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pulsar wind
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The breeze of high-energy particles flowing away from a spinning neutron star. (p. 233)
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Schwarzschild radius (RS)
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The radius of the event horizon around a black hole. (p. 242)
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singularity
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The object of zero radius into which the matter in a black hole is believed to fall. (p. 241)
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soft gamma-ray repeater (SGR)
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An object that produces repeated bursts of low-energy (soft) gamma rays. (p. 247)
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time dilation
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The slowing of moving clocks or clocks in strong gravitational fields. (p. 243)
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X-ray burster
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An object that produces repeated bursts of X rays. (p. 237)
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