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A hydrogen atmosphere is discovered on the extrasolar planet Osiris by the Hubble Space Telescope, the first atmosphere detected on an extrasolar planet.
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Hydrogen
Chemical element with atomic number 1 (H)
Hydrogen is a chemical element; it has symbol H and atomic number 1. It is the lightest and most abundant chemical element in the universe, constituting about 75% of all normal matter. Under standard conditions, hydrogen is a gas of diatomic molecules with the formula H2, called…Source: Wikipedia (CC BY-SA)
Atmosphere
Layer of gases surrounding an astronomical body held by gravity
An atmosphere is a layer of gases that envelop an astronomical object, held in place by the gravity of the object. A planet retains an atmosphere when the gravity is great and the temperature of the atmosphere is low. A stellar atmosphere is the outer region of a star, which…Source: Wikipedia (CC BY-SA)
Exoplanet
Planet outside of the Solar System
An exoplanet or extrasolar planet is a planet outside of the Solar System. The first confirmed detection of an exoplanet was in 1992 around a pulsar, and the first detection around a main-sequence star was in 1995. A different planet, first detected in 1988, was confirmed in…Source: Wikipedia (CC BY-SA)
HD 209458 b
Gas giant exoplanet orbiting HD 209458
HD 209458 b is an exoplanet, specifically a hot Jupiter, that orbits the solar analog HD 209458 in the constellation Pegasus, some 157 light-years from the Solar System. It is sometimes informally called Osiris. The radius of the planet's orbit is 0.047 AU, or one-eighth the…Source: Wikipedia (CC BY-SA)
Hubble Space Telescope
NASA/ESA space telescope launched in 1990
The Hubble Space Telescope is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, but it is one of the largest and most versatile, renowned as a vital research tool and as a public relations boon for…Source: Wikipedia (CC BY-SA)