A team of scientists announced they have harvested hydrogen from water in microgravity – a proof-of-principle test that may one day lead to a way to acquire fuel or other resources during a long-distance, crewed space mission.

Where will the fuel come from?

Will everything (including the human body) actually work after years in microgravity, where there are minimal buoyant forces?

An international team of researchers put their experiment into a theme-park-like drop tower to answer some of these questions.

“This is something new that hasn’t been done before that was surprisingly successful,” Katharina Brinkert, postdoctoral scholar at CalTech, told Gizmodo.

It’s essentially a theme park ride, where a 4.4-foot pneumatic tube shoots a capsule 104 miles per hour to a height of nearly 400 feet (120 meters).

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