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NASA spacecraft will use fuel that's safer for humans
Many spacecraft depend on hydrazine in their fuel, but it's extremely hazardous -- and that means very careful fueling processes that slow things down. NASA will soon have a safer option, however. It's about to test-fly the Green Propellant Infusion Mission, a spacecraft that ditches hydrazine in favor of a namesake "green" mix of hydroxyl ammonium nitrate with an oxidizer that lets it burn. It's safe enough that you could fuel a spacecraft while you're still building it, speeding up the launch process.
