“…and behind this bulkhead here is the reaction chamber. Inside, a captured wormhole mouth can be induced to open or close, and the outflowing energy is directed with a simple magnetic field to provide thrust.”
“Where’s the energy come from?”
“The other end of the wormhole.”
“Yeah, but where is it?”
“Well, nobody really knows. We still can’t manufacture synthetic wormholes. People have to go out and find natural ones, and some of them are highly energetic. Very lucrative.”
“But…where’s the energy come from?”
“Who knows? Maybe a star or something.”
“But what if—”
“Enough. What’s with the questions?”
Notes: This is a drabble, or a story of exactly 100 words.