A gamma-ray burst is a short, intense flood of gamma rays
A) from the sun.
B) from the black hole at the center of our galaxy.
C) from a nearby neutron star.
D) that may have caused biological extinctions in the past.
Correct Answer:
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Q37: In order to determine the mass of
Q38: Auroras consist of
A) colored clouds.
B) comet tails.
C)
Q39: There is a surprisingly small variation among
Q40: The less the mass of a main-sequence
Q41: At the end of its period in
Q43: Brown dwarfs are
A) visible to the naked
Q44: The smallest of the following celestial objects
Q45: Black holes are the remnants of
A) stars
Q46: Brown dwarfs
A) are members of the main
Q47: What keeps light from escaping from a
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