‘WALL-E meets Apollo 13’: why Good Night Oppy documentary about a Nasa Mars rover will bring tears to your eyes

• When Mars rover Opportunity (Oppy) sent the message ‘My battery is low and it’s getting dark’, it grabbed the hearts of Nasa scientists, and filmmakers
• Oppy documentary maker Ryan White was fascinated at people pouring emotions into objects and, with Industrial Light & Magic’s help, gives us a real tear-jerker