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" ... Artist's concept illustrating Kepler-16b, the first directly detected circumbinary planet, which is ... [+] a planet that orbits two stars. The two orbiting stars regularly eclipse each other, as seen from our point of view on Earth. The planet also eclipses, or transits, each star. Stellar eclipses are shown here, as well as the transits of the planet across both stars. ... "
" ... Yet if strictly looking for lower mass binaries, such as Red M-spectral type dwarfs, the expected fraction of circumbinary planets would be less than ten percent, Vladimir Airapetian, a senior astrophysicist at NASA Goddard Space Flight Center, told me. And of this 10 percent, less than three percent would likely be habitable. ... "