When hydrogen fusion ends within the core of a star, the core becomes __________ and __________.
A) hotter, expands
B) hotter, contracts
C) cooler, expands
D) cooler, contracts
Correct Answer:
Verified
Q24: The radiation emitted by stars, galaxies, and
Q27: Neutron stars are _.
A) dense stars where
Q29: A red giant:
A) has an extremely hot
Q30: A _ is a concentration of billions
Q31: Our Sun is _ as a main-sequence
Q33: Sunspots are areas:
A) caused by the Sun's
Q36: Different regions of the Sun have different
Q36: All main-sequence stars are composed primarily of
Q38: The major reason for differences in temperature
Q39: The _ brightness of a star is
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