Asa Butterfield in "Ender's Game." (Summit Entertainment) Asa Butterfield in “Ender’s Game.” (Summit Entertainment)

“Ender’s Game,” out Friday, mostly takes place at a military school that is more awesome because it is in space, thereby making it easier to train child soldiers to kill aliens. Know what else is easier in space? Risking your life.

You wouldn’t think hitchhikers would be a big problem in space, but then you also would expect your chest cavity to remain intact. This 1979 sci-fi classic will disabuse you of both ideas.

‘2001: A Space Odyssey’
You know how your computer acts up at just the wrong moment? Now imagine that Spinning Wheel of Death leading to ACTUAL DEATH, as it does in Stanley Kubrick’s 1968 film.

‘Airplane II: The Sequel’
Technology fails again in this 1982 comedy as a shuttle’s autopilot sends the bird straight for the sun. Who would have thought fiery death could be so hilarious?

This 1986 film (whose title weirdly lacks a space) is about teenagers who “accidentally” get launched into orbit. We’re sure the fact their parents had it up to HERE had nothing to do with it.

We don’t spoil films currently in theaters, but so many bad things happen in the trailer that it’s essentially a two-minute NASA anti-recruitment film.