Smallest Exoplanet Discovered

ESA Space Science reports that COROT has discovered the smallest ever estra-solar planet.
From the article:

• COROT-Exo-7b, is different: its diameter is less than twice that of Earth and it orbits its star once every 20 hours, and has a high (surface) temperature, between 1000 and 1500°C.

The composition of the planet is still is still under investigation.

• It may be rocky like Earth and covered in liquid lava. It may also belong to a class of planets that are thought to be made up of water and rock in almost equal amounts. Given the high temperatures measured, the planet would be a very hot and humid place.

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