How will future astronauts get back home to Earth from Mars? According to a new study, they could make rocket fuel from the methane that’s already on the Red Planet. 

Researchers have devised a new way to create methane-based rocket fuel that they hope could make return trips from Mars far more feasible. This method was previously theorized by Elon Musk and engineers at SpaceX who considered ways to use carbon dioxide and water from ice on Mars to have the necessary carbon and hydrogen necessary to create methane.