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Does anyone know of alternative fuel being considered by NASA?

I'm doing a project for school and I need information on at least 3 alternatives fuel sources for rockets..like, the NASA rockets. Any help would be greatly appreciated, and if you know anything on the price, danger level, abundance or location, please include that. Thank you so much!

Public Comments

1. Ion propulsion , Solar Winds , well for three Nuclear , no "dangers" if properly used , well don't know where Star Trek came up with those Dilithium Crystals LOL
2. Plasma Hydrogen Space Elevator