Explosions are possible (Solar Flares are explosions), fire needs an oxidizer (Oxygen is not the only oxidizer). Fire would look different in space though.

https://www.scienceabc.com/nature/universe/can-spaceships-actually-explode-like-they-do-in-movies.html#:~:text=In%20space%2C%20there%20is%20no,once%20they%20%E2%80%9Cblow%20up%E2%80%9D.