Final answer:
Supergiants are extremely bright, massive stars with varying temperatures and can be as much as 10,000 times as luminous as the Sun, with diameters larger than the Sun.
Explanation:
O Supergiants are very bright, extremely massive stars with varying temperatures. These stars are located at the upper left of the H-R diagram, are exceedingly hot, very blue stars of spectral type O, and can be as much as 10,000 times as luminous as the Sun. They have diameters much larger than that of the Sun, with some so large that the star's surface would extend beyond the orbit of Mars.
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