Strangely, though the surface of the Sun is only 10,000 degrees, its corona — the outermost layer of its atmosphere — is 1.8 million degrees, the hottest part of the Sun's atmosphere.
Eta Carinae could be as large as 180 times the radius of the Sun, and its surface temperature is 36,000-40,000 Kelvin. Just for comparison, 40,000 Kelvin is about 72,000 degrees F. So it's the blue hypergiants, like Eta Carinae, which are probably the hottest stars in the Universe.
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Explanation:
Strangely, though the surface of the Sun is only 10,000 degrees, its corona — the outermost layer of its atmosphere — is 1.8 million degrees, the hottest part of the Sun's atmosphere.
Answer:
Eta Carinae could be as large as 180 times the radius of the Sun, and its surface temperature is 36,000-40,000 Kelvin. Just for comparison, 40,000 Kelvin is about 72,000 degrees F. So it's the blue hypergiants, like Eta Carinae, which are probably the hottest stars in the Universe.
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