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Q&A Most common element in the universe that could theoretically be a fuel?

I'm making a small game about travelling deep space on limited resources. One thing I'm interested in having is the idea that the craft is scavenging what it can from planets as it travels through ...

5 answers  ·  posted 9y ago by SuperBiasedMan‭  ·  last activity 8y ago by SuperBiasedMan‭

Question space technology