Board Thread:Off-topic/@comment-26462356-20160826052936/@comment-5518179-20160826215100

MiniDaggers wrote:

Why wasn't it noticed until now? Because there is no light in space, and the only way for us to tell if a planet exists is by putting immense focus on one star and waiting for a very, very, very slight shift in that star's luminoscity, since that is the planet itself orbiting over the star.

Obviously, that very minor discrepancy in luminoscity was found just now.