What slows down the contraction of a star-forming cloud when it makes a protostar?
(a) production of fusion energy
(b) magnetic fields
(c) trapping of thermal energy inside the protostar
answer
(c) trapping of thermal energy inside the protostar
question
Which of these stars has the hottest core?
(a) a white main-sequence star
(b) an orange main-sequence star
(c) a red main-sequence star
answer
(a) a white main-sequence star
question
Which of these stars has the hottest core?
(a) a blue main-sequence star
(b) a red supergiant
(c) a red main-sequence star
answer
(b) a red supergiant
question
Which of these stars does not have fusion occurring in its core?
(a) a red giant
(b) a red main-sequence star
(c) a blue main-sequence star
answer
(a) a red giant
question
What happens to a low-mass star after helium fusion begins?
(a) Its luminosity goes up
(b) Its luminosity goes down.
(c) Its luminosity stays the same.
answer
(b) Its luminosity goes down.
question
What would stars be like if hydrogen had the smallest mass per nuclear particle?
(a) Stars would be brighter.
(b) All stars would be red giants.
(c) Nuclear fusion would not occur in stars of any mass.
answer
(c) Nuclear fusion would not occur in stars of any mass.
question
What would stars be like if carbon had the smallest mass per nuclear particle?
(a) Supernovae would be more common.
(b) Supernovae would never occur.
(c) High-mass stars would be hotter.
answer
(a) Supernovae would be more common.
question
What would you be most likely to find if you returned to the solar system in 10 billion years?
(a) a neutron star
(b) a white dwarf
(c) a black hole
answer
(b) a white dwarf
question
In which of the following objects does degeneracy pressure fail to stop gravitational contraction?
(a) a brown dwarf
(b) a white dwarf
(c) the core of a high-mass star
answer
(c) the core of a high-mass star
question
What happens to the core of a high-mass star after it runs out of hydrogen?
(a) It shrinks and heats up.
(b) It shrinks and cools down.
(c) Helium fusion begins right away.
answer
(a) It shrinks and heats up.
question
Which of these star clusters is youngest?
(a) a cluster whose brightest main-sequence stars are white
(b) a cluster whose brightest stars are red
(c) a cluster containing stars of all colors
answer
(c) a cluster containing stars of all colors
question
Which of these star clusters is oldest?
(a) a cluster whose brightest main-sequence stars are white
(b) a cluster whose brightest main- sequence stars are yellow
(c) a cluster containing stars of all colors
answer
(b) a cluster whose brightest main- sequence stars are yellow
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