The Bad Astronomer writes: "For the first time, a planet has been found in a stellar system composed of four stars. The planet, called PH-1, orbits a binary star made of two sun-like stars in a tight orbit. That binary is itself orbited by another binary pair much farther out. Even more amazing, this planet was found by two "citizen scientists", amateurs who participated in Planet Hunters, a project which puts Kepler Observatory data online for lay people to analyze. At least two confirmed planets have been found by this project, but this is the first — ever — in a quaternary system."
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