Exoplanet is a relatively new word used to describe a planetary body orbiting a star other than our own Sun. The word is a combination of Extra Solar Planet.
In early 1992, radio astronomers Aleksander Wolszczan and Dale Frail announced the discovery of planets around pulsar PSR 1257+12. This discovery was quickly confirmed, and is generally considered to be the first definitive detection of an exoplanet.
More information: How to Find an Exoplanet
Since then Exoplanets have been discovered at an ever increasing rate, and as of November 2008, 322 exoplanets have been detected and confirmed.
HD189733b is the third planet of the red dwarf star Gliese 581 and is roughly the size of Jupiter. It is now known to contain methane and water in its atmosphere, the first time organic molecules have been detected in an extra solar planet. Astronomers used the Hubble Space Telescope with the help of the Spitzer Space Telescope and studied how light from the host star filters through the planet’s atmosphere using a process called spectroscopy.
The planet is near the southern constellation of Hydra and approximately 200 light years from Earth.
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