What are the two longest stages in the life of a one-solar-mass star
A) Protostar, pre-main-sequence
B) Protostar, white dwarf
C) Protostar, main-sequence
D) Main-sequence, white dwarf
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Q18: Giant and supergiant stars are rare because
A)they
Q19: In degenerate matter
A)pressure depends only on the
Q20: A(n) _ is a collection of 10
Q21: A planetary nebula is
A)the expelled outer atmosphere
Q22: A planetary nebula has a radius
Q24: The Chandrasekhar limit tells us that
A)accretion disks
Q25: Synchrotron radiation is produced
A)in planetary nebulae.
B)by red
Q26: The theory that the collapse of a
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A)occurs when a white
Q28: Stars with masses between 0.4- 
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