If the Milky Way formed stars at approximately a constant rate over the last 14 billion years,what fraction of the M-type stars that ever formed in it can still be found as main-sequence stars today? Note that M-type stars have a mass of approximately 0.5 M⨀.
A) 10 percent
B) 33 percent
C) 50 percent
D) 75 percent
E) 100 percent
Correct Answer:
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Q11: If a main-sequence star's core temperature increased,
Q12: The luminosity of a star depends on
A)
Q23: Place the following evolutionary stages in order
Q25: A main-sequence star is unique because:
A) hydrostatic
Q26: If there were mixing processes in a
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Q27: You observe a 0.8 M⨀ white dwarf
Q27: As a main-sequence star burns its core
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Q40: For low-mass main-sequence stars in hydrostatic equilibrium,
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