The AI-powered English dictionary
comparative more superluminal, superlative most superluminal
(astronomy, physics, fiction, fantasy) Faster than light; having a speed greater than light. quotations examples
The first thing to understand about superluminal expansion is that it isn't visible to the unaided eye. The objects that appear to be moving faster than light are emitting radio waves, not visible light.
1984, Edward Edelson, “Faster than light?”, in Popular Science, retrieved 20 November 2013, page 70