As we plan for future interplanetary spaceflight, one major aspect remains untested: refueling in space. That’s because most rocket propellants are cryogenic liquids whose long-term behavior in space is still unknown. Purdue University researchers are collaborating with NASA to study cryogenic liquids in zero gravity, leading to the possibility of propellant depots and refueling spacecraft in orbit: https://engineering.purdue.edu/ME/News/2024/cryogenics-in-zero-gravity | Purdue University Mechan