A) supernova remnant
B) protostar
C) planetary nebula
D) red supergiant
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A) gas created from the remains of planets that once orbited a dead star
B) gas ejected from a low- mass star in the final stage of its life
C) the remains of a high- mass star that has exploded
D) interstellar gas from which planets are likely to form in the not- too- distant future
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A) vi
B) viii
C) ii
D) v
E) iii
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A) mass of the star.
B) star's lifetime.
C) rate of energy generated from nuclear reactions in the star's core.
D) temperature of the star's core.
E) star's apparent brightness.
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To provide scientific evidence for the h...View Answer
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A 10- solar- mass star has a v...View Answer
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A) will always be a black hole
B) will always be a neutron star
C) may be either a neutron star or a black hole
D) may be either a white dwarf, neutron star, or black hole
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A) the Sun
B) a white dwarf
C) a low- mass star
D) a high- mass star
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A) Most of the brown dwarfs in the Milky Way Galaxy would be quite young in age.
B) Brown dwarfs would be responsible for most of the overall luminosity of our Milky Way Galaxy.
C) Brown dwarfs would outnumber all ordinary stars.
D) Brown dwarfs would be extremely rare.
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A) Brown dwarfs are supported against gravity by degeneracy pressure, which does not depend on the object's temperature.
B) Brown dwarfs form like ordinary stars but are too small to sustain nuclear fusion in their cores.
C) All brown dwarfs have masses less than about 8% that of our Sun.
D) Brown dwarfs eventually collapse to become white dwarfs.
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A) Although both stars probably formed from the same clump of gas, the more massive one must have had its birth slowed so that it became a main- sequence star millions of years later than its less massive companion.
B) The main- sequence star probably is a pulsating variable star and therefore appears to be less massive than it really is.
C) The two stars probably were once separate but became a binary when a close encounter allowed their mutual gravity to pull them together.
D) Other than the very low odds of finding a system with two such massive stars, there is nothing surprising about the fact that such systems exist.
E) The giant must once have been the more massive star but transferred some of its mass to its companion.
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A) visible light
B) infrared
C) blue light
D) ultraviolet
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A) has higher main- sequence luminosities than high mass stars
B) ends its life as a supernova
C) late in life, fuses carbon into oxygen
D) has longer lifetimes than high mass stars
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A) M star
B) B star
C) G star
D) O star
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A) The core contracts and becomes a black hole.
B) The star explodes violently, leaving nothing behind.
C) The core contracts and becomes a ball of neutrons.
D) Gravity is not able to overcome neutron degeneracy pressure.
E) The core contracts and becomes a white dwarf.
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A) the cores of low- mass stars never get hot enough for carbon fusion
B) only high- mass stars do fusion by the CNO cycle
C) carbon fusion can occur only in the stars known as carbon stars
D) the cores of low- mass stars never contain significant amounts of carbon
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A) at the instant that the first hydrogen fusion reactions occur in the protostar's core
B) when it becomes luminous enough to emit thermal radiation
C) when a piece of a molecular cloud first begins to contract into a star
D) when the rate of hydrogen fusion becomes high enough to balance the rate at which the star radiates energy into space
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A) all stars that are yellow in color
B) stars that have reached an age of 10 billion years
C) stars that are at least several times the mass of the Sun
D) stars that are similar in mass to the Sun
E) all stars that are red in color
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