Explosions or something like it.

Another thing that is in many movies and is wrong but enjoyable to watch is explosions in space. Many of us know that this is false but we still constantly see it in many movies. In my senior design class my group and I have worked on a project that deals with explosions. Explosions are different than deflagration and different than combustion. the main difference is the rate in which they occur, meaning the time and speed at which they occur.
An explosion is a rapid increase in volume and a release of energy in an extreme manner
Deflagration is a combustion at a subsonic level meaning slower than the speed of sound
Combustion is slower than both and deals with burning in general
technically, deflagration and combustion are in the same category and deflagration is faster or (high/ fast combustion) but there is a difference.

With that said, all these have a key similarity which is they need fuel. In space the presence of oxygen as fuel is non existent meaning when the ship or whatever blows up, you wouldnt see the grand "light show" that we call and explosion occur. Now I understand that there could be oxygen or fuel present by the bomb or on the ship etc.. however it would not in most cases be enough to trigger the huge flames and what not that is seen in the movies, that part of the explosion requires much more fuel to continue a burn and in space it is just not very realistic.