Chance of alien life ‘goes to heart’ of space missions, Nasa chief says

Jared Isaacman says odds of evidence we are not alone are pretty high' four days after Artemis II rocket lifted off

• Nasa's Orion spaceship four days into Artemis II mission: in pictures

The top official at Nasa says that the chance of alien existence is a factor in how the US space agency plans its missions.

Speaking on Sunday, Nasa administrator Jared Isaacman told CNN's Meet the Press that investigating the existence of alien life goes to the heart of many things that we do at Nasa", adding: Our job here is to go out and try and unlock the secrets of the universe."