Suppose our Sun were suddenly replaced by a supergiant star. Which of the following would be true?
A) Earth would be inside the supergiant.
B) The supergiant's surface temperature would be much hotter than the surface temperature of our Sun.
C) Earth would fly off into interstellar space.
D) The supergiant would appear as large as the full Moon in our sky.
A) Earth would be inside the supergiant.
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