On Wednesday, Sotheby’s will auction off a chunk of rock believed to have originated on Mars for an anticipated two to four million dollars – a steal relative to the $28 million you would have dropped to experience a few fleeting minutes of zero gravity with Katy Perry.

The model Kite’s team built was unique in that it captured evolution of the Martian landscape and climate over an extremely long time. “This has been under development for the last couple of years, along with the paper on the carbonate rocks,” says Tutolo, who was the second author of Kite’s study.