Did you know that if the Sun were made of bananas, it would be just as hot. The Sun is hot because its enormous weight creates vast gravity, putting its core under colossal pressure. If, instead of hydrogen, you got a billion billion billion tons of bananas and hung it in space, it would create just as much pressure, and therefore just as high a temperature.
Of course, a banana Sun would rapidly cool down from its initial heat rather than burning for billions of years. That's because it's not made of hydrogen and the fusion reaction that keeps it going wouldn't get under way.
This, and some other Weird Physics Facts.
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