Washington - The orbiting Kepler telescope has spotted a Jupiter-sized planet around another star - a sighting that demonstrates it can see Earth-like planets if they are out there, scientists reported on Thursday.
The planet, called HAT-P-7b, was already among the 300 or so known so-called extrasolar planets, the team led by the US space agency Nasa reported. But measurements of its orbit by Kepler show the telescope will be able to see smaller planets, they reported in the journal Science.
"Kepler is operating at the level required to detect Earth-size planets," the team, led by William Borucki of the Nasa Ames Research Centre in Moffett Field, California, reported.
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Kepler was launched in March with the specific goal of finding Earth-sized planets that might support life outside our solar system. It orbits the sun behind the Earth and in theory should be able to spot things that Earthbound telescopes and even the orbiting Hubble telescope cannot.
It uses a standard planet-hunting method - watching for the slight dimming of a star's light as a planet passes in front of it.
Borucki's team is looking at data from Kepler's observations of more than 50 000 stars.
Editing by Eric Beech
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