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17 Cards in this Set

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black hole
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)
collapsar
A star of high mass that collapses into a black hole. A possible source of gamma-ray bursts. (p. 247)
event horizon
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)
gamma-ray burster
An object very faint at visual wavelengths that produces a sudden, powerful burst of gamma rays. (p. 246)
gravitational radiation
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)
gravitational redshift
The lengthening of the wavelength of a photon due to its escape from a gravitational field. (p. 243)
hypernova
Produced when a very massive star collapses into a black hole. Thought to be a possible source of gamma-ray bursts. (p. 247)
magnetar
A class of neutron star having very strong magnetic fields. (p. 247)
millisecond pulsar
A pulsar with a pulse period of only a few milliseconds. (p. 238)
neutron star
A small, highly dense star composed almost entirely of tightly packed neutrons. Radius about 10 km. (p. 230)
pulsar
A source of short, precisely timed radio bursts. Believed to be spinning neutron stars. (p. 231)
pulsar wind
The breeze of high-energy particles flowing away from a spinning neutron star. (p. 233)
Schwarzschild radius (RS)
The radius of the event horizon around a black hole. (p. 242)
singularity
The object of zero radius into which the matter in a black hole is believed to fall. (p. 241)
soft gamma-ray repeater (SGR)
An object that produces repeated bursts of low-energy (soft) gamma rays. (p. 247)
time dilation
The slowing of moving clocks or clocks in strong gravitational fields. (p. 243)
X-ray burster
An object that produces repeated bursts of X rays. (p. 237)