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Avi Loeb: `Oumuamua is EXTRATERRESTRIAL (#307)

Into the Impossible With Brian Keating

CHAPTER

The Different Types of Comets

This is a muamua, the first object that came from interstellar space. It is a comet, but what evaporates from it is hydrogen, which is transparent. To calculate how much hydrogen comes out, they calculate the surface temperature of this ice to demonstrate that you can get evaporation. The Earth has a temperature just around the freezing temperature of water. And we have a little bit of a greenhouse effect on Earth and that's why it's habitable. Same is true about Mars.

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