Extrasolar planet HD 189733b
NASA, ESA, and G. Bacon (STScI)
This artist's illustration depicts the extrasolar planet HD 189733b, with its parent star peeking above its top edge. Astronomers used the Hubble Space Telescope to detect methane and water vapor in the Jupiter-sized planet's atmosphere. They made the finding by studying how light from the star filters through the planet's atmosphere.