It’s no secret that physicist Stephen Hawking thinks humans are running out of time on planet Earth.

In a new BBC documentary, Hawking will test his theory that humankind must colonize another planet or perish in the next 100 years. The documentary Stephen Hawking: Expedition New Earth, will air this summer as part of BBC’s Tomorrow’s World season and will showcase that Hawking's aspiration "isn’t as fantastical as it sounds," according to BBC.

For years, Hawking has warned that humankind faces a slew of threats ranging from climate change to destruction from nuclear war and genetically engineered viruses.

While things look bleak, there is some hope, according to Hawking. Humans must set their sights on another planet or perish on Earth.

“We must also continue to go into space for the future of humanity,” Hawking said during a 2016 speech at Britain’s Oxford University Union.

In the past, Hawking has suggested that humankind might not survive "another 1000 years without escaping beyond our fragile planet.” The BBC documentary hints at an adjusted timeframe for colonization, which many may see in their lifetime.