New Scientist
Extrasolar planet hunters will set their sights close to home on Tuesday when Venus passes in front of the Sun for the first time since 1882.
About 120 planets have been discovered orbiting other stars. Three of these were revealed because they dimmed their stars' light during transits, which also gave information about the planets' masses. And future space missions such as NASA's Kepler, due to launch in 2007, aim to find many more transits by monitoring 100,000 Sun-like stars.
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