The Amen -Ra Nebula is a vast expanse of gas on the fringes of Earth controlled territory. Like most nebulae, it is mostly comprised of ionized hydrogen and helium, with a few trace elements of higher mass.
What sets Amen-Ra apart from its galactic peers is the incredibly young stellar nursery in its center. Rather than refining hydrogen from the atmospheres of planets, trawlers dip into the denser cloud and magnetically capture the ionized gasses. These captured gasses are compressed into tanks and transported to processing facilities to be refined into Handwavium 274.