Physicist: Brace yourself for a mess of guesses:I’ve heard (anecdotally, and on Mythbusters) that explosions in water are more dangerous that than explosions in the air. For an explosion in space, the only thing that carries the energy to you is light (which you would have gotten anyway) and material from the explosive itself. Interesting aside: The famous EMP (electro-magnetic pulse) that follows soon after an atmospheric nuclear detonation would be absent in space (deep space anyway). Deep seated pet peev: The kick-ass billowing explosions of Vin-Diesel movies will also be missing from explosions in space. Instead, the explosion would appear as a “star burst” of material all flying outward in straight lines.