Students are watching a science fiction movie where the crew of one spaceship watches an explosion on the other spaceship. After a short time interval the crew hear the sound of the explosion. The students think it is unphysical.
a) The students are right, because there should be no delay: the sound propagates in vacuum at the speed of light.
b) The students are wrong. The science advisor of the movie made it according to the laws of physics.
c) The students are right, because the steel body of the spaceship blocks the sound
d) The students are right, because sound cannot propagate in the region between the spaceships