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Plenty of really hot things exist in the universe. But do we know of fire anywhere besides on our planet?

Tom Malkoch, Plymouth Meeting, Pennsylvania
RELATED TOPICS: SOLAR SYSTEM
Lava in Io's Tvashtar Catena
Fire has occurred here on Earth for millions of years and was harnessed by humans more than 100,000 years ago. But like humans, fire requires free oxygen — molecular oxygen uncombined with other elements. This free oxygen has not been detected in appreciable amounts in our solar system or on exoplanets.

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