A space movie that raises interesting ethical issues

MOVIES set in outer space have been de rigueur in recent years, and their narratives typically have something in common: human beings in distress. If it's not one thing, like being stranded in space (Gravity, 2013) or on a distant planet (The Martian, 2015), it's another, like having to locate a new home for the human race (Interstellar, 2014).

This year's entry in the sci-fi space stakes is a film about an ultra-long trip undertaken by an interplanetary traveller who's lost and alone despite being on a spaceship with 5,00…