Citizen Astronomers
The Planet Hunters website, which was launched in December 2010, lets the public search for exoplanets—planets orbiting other stars—in data from NASA’s Kepler planet-search project, which images a star field containing some 160,000 stars, measuring each star’s brightness every half hour. The volunteers look at light curves—graphs showing fluctuations in a star’s brightness over a period of roughly a month—looking for transits, brief dips in a star’s brightness that could indicate the passage of an unseen object, possibly a planet, in front of the star. Public response to this project has been overwhelming; more than 170,000 people have registered at the site."
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