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Episode 75: Hot Comets?

Play Dec 28•4:18

Comets travel to Earth and the Sun on orbits that originate in the far reaches of our solar system. From observations and samples collected from a few comets, it seemed that the icy realm far beyond the orbit of Pluto was their birthplace. Comets have been called "dirty snowballs" because they?re composed mostly of ice and some grainy material. The results emerging from the Stardust mission, w...

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