Steam? Don’t make me laugh. See the graph/illustration below from gigazine.jp –
Don’t you get it? Then go see Gundam V. If Japan wanted, they could make some – maybe not a lot, but some. Hell, I want them to power the RX-78 “Dummy” with it! Didn’t you know? In about a few hundred years, they will make Gunbuster based on nuclear power! Space Monsters beware! The Japanese is here! Inazumaaaaaaaa Kick! Solar powered reaction drive in Gundam 00? What do you think solar power is based on?
Lol XD. Moving on…