What is the duration of a gamma-ray burst?
A) as short as one-hundredth of a second, indicating a source smaller than Earth
B) several days, indicating a size much smaller than the distance from Earth to the nearest star beyond the Sun
C) up to about 1 day, indicating a source several times the size of our solar system
D) several hours, indicating a source size about equal to the diameter of Uranus's orbit
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