Mankind may only have a brief window to set foot on Mars before a disaster such as a third World War makes it no longer possible, Elon Musk has warned.
The founder of SpaceX, which was the first private company to resupply the International Space Station, fears such a war could set back technological advancements.
His company is preparing to announce its ambitious plans for rocket and spacecraft technology to carry humans to the red planet.
It's already too late. To read more, click here.