The ship used a fusion reactor for power. Although there was an onboard supply of hydrogen, fuel would be gathered in-flight from the interstellar medium. However, unlike in the old science-fiction novels, the gathered hydrogen wasn’t used for propulsion—at least not in the traditional way, as reaction mass. Heaven-1 used a reactionless system, the SURGE drive. I wanted to sigh. These people were so hung up on acronyms. I had yet to read up on the theory, but it seemed to push against the fabric of space in some way. Must read. Goes on the TO-DO.