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Tomorrow in Florida, Nasa launches the Kepler probe - a new mission to find planets similar to Earth. Our science correspondent, Ian Sample, says its the most extensive such search yet.
Mission scientists will use Kepler's 95 megapixel digital camera to survey the brightness of 100,000 stars in the constellations of Cygnus and Lyra every half an hour. Planets will reveal themselves as almost imperceptible reductions in brightness as they move across the faces of thei...
The US space agency, Nasa, is due to launch a space telescope, called Kepler, dedicated to searching for planets that are similar to, or smaller than Earth. It will join the European Space Agency's Corot telescope, which spotted a large "super Earth" earlier this month.