Can explosions work in space?

Even only 300 molecules per coffee cup there would still technically be a slowing down from bumping into molecules in space because those molecules would be hit by the object moving and then bounce away with gained energy unless it's large enough to stick the molecules to the object in which case the object would gain additional Mass which would therefore slow down the object as well granted this would be at a few trillion times less than in our atmosphere however this does not mean it would not happen at all it might take you 10 times longer than the universe has existed slow down even to a noticeable degree such as half a mile an hour slower however it would technically still slow you down some