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Episode 87: Planet Leaks Hydrogen

Play Mar 8•4:18

A large planet, the size of Jupiter, orbits the star HD 209458. The planet, creatively called HD 209458b, has been studied extensively since its discovery in 1999. Its orbit periodically brings the planet between its star and us, allowing astronomers to detect it using a technique called spectroscopy. The planet's orbit is short, about 3.5 days, because the planet is very close to the parent st...

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