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TIL until 1929, less than 100 years ago, man didn't know there were other galaxies outside of the Milky Way. Edwin Hubble and his "computer", a woman named Henrietta Leavitt calculated stars called cepheids could accurately measure long distances, proving the Andromeda "nebula" was a separate galaxy

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Bd5K TIL that in 1991 Spacewatch discovered an artificial body near earth that is now listed on the NASA Astrophysics data system as a possible alien probe that was observed in the vicinity of our planet. Its orbit will bring it back to earth in 2016.
WkGgA TIL Pearl Jam discovered Ticketmaster was adding a service charge to all their concert tickets without informing the band. The band then created their own outdoor stadiums for the fans and testified against Ticketmaster to the United States Department of Justice
Wvno TIL that before trees were common, Earth Was Covered by Giant Mushrooms
NKBQ TIL that in response to South Park satirising Scientology, Scientologists put out a statement on behalf of Isaac Hayes (Who plays the character Chef and is a Scientologist) quitting the show, taking advantage of him being barely functional and unable to talk due to a stroke.
E1pB7 TIL "yé-yé" was a music genre which emerged in the 1960s. Its name was derived from the English "yeah! yeah!", popularised by beat and rock and roll bands such as the Beatles.