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Hydrogen
Material, Fuel
The most abundant element in the universe is the lightest gas.
Summary
Hydrogen. The most important element in the universe. At first, when a player starts to get Hydrogen, they have very little use for it, and may consider it a nuisance. By late game, however, Hydrogen may very well become your bottleneck. There are many ways to get Hydrogen, including several different recipes, as well as gathering it directly from Gas Giant:Gas Giants using Orbit Collector:Orbital Collectors.