Ad Astra: Brad Pitt, James Gray talk about making Apocalypse Now in space – ‘there were so many walls we just kept hitting’

• Pitt put his trust in director but says filming wasn’t easy. ‘We were trying to do a film about a man’s inability to connect with others yet he was often alone’
• Gray was fascinated by the people who go into space. ‘Your heart rate never goes above 80, but there’s a deeply … screwed up person underneath that surface.’