http://hubblesite.org/newscenter/archive/releases/2012/07/full/ "This means, statistically, every star in the galaxy should have at least one planet, and probably more," said Sahu. "Results from the three main techniques of planet detection are rapidly converging to a common result: Not only are planets common in the galaxy, but there are more small planets than large ones," said Stephen Kane, a co-author from NASA's Exoplanet Science Institute at the California Institute of Technology, Pasadena, Calif. "This is encouraging news for investigations into habitable planets." 也有人主张 光是本银河系里的行星就是以千亿计的 --

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