It has been 10 days since famed physicist Stephen Hawking, and he is leaving the world with some incredible last words. In his final appearance in the Smithsonian Channel documentary, “Leaving Earth: Or How to Colonize Planet,” Hawking described a stunning vision of humanity looking to the stars and leaving this planet to inhabit new worlds well beyond our solar system.

You can watch him do it when the show airs on March 25 in what will be one of the last TV projects you will ever see him in now that he has passed away after 76 years on this Earth. Hawking feels that this is the most important question facing humanity: namely, where we will go and how we will colonize Earth 2.0, as it’s been referred to.

It is certainly an extraordinary time for humanity, as in just the last few years we’ve discovered that every star is on average orbited by multiple planets, and there could be many in the “goldilocks” zone that would be inhabitable for humans. “Leaving Earth” describes the search for just such a planet, and what kind of spacecraft we would need to get there, as well as other technologies that would make such a colony possible.

Hawking has often talked about colonizing other worlds to preserve humanity and turn it into a multi-planet species that would no longer be at risk of being wiped out by a well-placed asteroid strike, or perhaps a self-inflicted wound like nuclear war.