In Batman v Superman (Ultimate Edition), the government decides to nuke Superman and Doomsday when Superman lures/takes the fight with Doomsday into space:
The missile separating to signify its entry into space.
So, the nuclear missile hit them when they were in space:
..and it detonated, resulting in Doomsday and Superman falling back to the earth's surface.
If a nuclear weapon is exploded in a vacuum, i.e, in space, the complexion of weapon effects changes drastically:
First, in the absence of an atmosphere, the blast disappears completely.
Second, thermal radiation, as usually defined, also disappears. There is no longer any air for the blast wave to heat and much higher frequency radiation is emitted from the weapon itself.
In the movie, after when they are hit by the nuclear missile, the Government people manning the nuclear launch mission even talk of "re-entry", confirming that the missile hit Superman and Doomsday out of earth's atmosphere. Also, we don't see the usual blast wave that results when a nuclear explosion detonates, which is when the air around it is rapidly displaced by the explosion.
My Question: How is it possible that the bomb detonated in space when there is no air. And how did Doomsday absorb any energy when according to science, there is no thermal energy released when a bomb detonates in space?