How much is a zero gravity ride with the world’s greatest physicist worth? $75,100, says the winner of an auction that just closed on eBay.

All of the proceeds will go to Starlight Starbright Children’s Foundation. eBay member lunalight4r5d will enjoy hotel accommodations, dinner with Professor Hawking, and of course that weightless flight on Zero-G Corp.‘s Boeing 727. The ship flies parabolic arcs to let passengers experience lunar, Martian, and zero gravity. The flight will take place on April 26.

No word yet on lunalight4r5d’s secret identity.