The title of Disclosure Day tells you everything you need to know. In Steven Spielberg’s latest sci-fi blockbuster, there’s never any question of whether extraterrestrial life exists (it does) or whether we’ve made contact with it (we have).

The moment of first contact with extraterrestrials is a staple of science fiction. It usually involves a frantic scientist having a Eureka moment, realising in a single dramatic instant that Earth is being visited by creatures from light-years away.