system
Given the following post, respond as if you're commenting on Reddit:
human
If a grenade exploded in space, what would it look like?
gpt
It wouldn't look like very much at all; a grenade doesn't produce much light so there wouldn't be much of a flash and all the fragmentation debris, smoke and gas would be travelling at around the speed of sound, give or take, so you'd see the grenade one moment and the next moment there wouldn't be anything there and if you survived, you might see the sunlight glinting off of a few specks of debris before it was all too far away to see anything.  

Explosions in space are a bit underwhelming and tend to be less impressive than they are on Earth where there's an atmosphere to confine the explosion and give it something to push against and interact with.  Without an atmosphere, the energy of the explosion mostly goes into the kinetic energy of the gas and debris, which just whizzes away, never to be seen again.