Tag: HD 209458 b

November 27, 2001: First Atmosphere Discovered on Extrasolar Planet

Today in 2001, NASA and the ESA's Hubble Space Telescope detected sodium in the atmosphere surrounding HD 209458 b, nicknamed Osiris. This marked the first time that an atmosphere had been detected on an exoplanet (a planet outside of our Sun's solar system). The find was predicted by award-winning exoplanet expert Sara Seager weeks before.

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