The “other planet” that could be humanity’s saving grace, according to Mr Musk, is the Red Planet Mars.
The SpaceX boss is a firm believer humanity stands on the brink of colonising the neighbouring world.
Towards this goal, he is developing SpaceX’ Starship spacecraft – an interplanetary launched vehicle designed to ferry humans to the Moon, Mars and beyond.
Mr Musk said: “It’s only just possible to travel to Mars. Just barely.
“If G was 10 percent more, wouldn’t work really. If G was 10 percent lower, it would be easy.