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Use "sublight" in a sentence
"The ship should have dropped out of warp some distance out, and be making its final approach well below sublight."
"However, for the last hundred years or so, the larger sublight vessels, like the cruise ship, rely on MASIS for their primary propulsion."
"“The braking thrusters are firing too hot!” she said, shouting to be heard above the overstrained sublight propulsion system that seemed about to rattle the ship apart."