Stephen Hawking is known for his groundbreaking achievements in science, but many do not realize that the physicist is also recognized for making predictions about the future of humanity and Earth.

We Have Only 100 Years Left On Earth

Thanks to modern day healthcare, 100 years is nearly a lifetime, but Hawking proposed that this is how long humans have left on Earth, Wired reported. This is a stark shift backward from the 1,000 years time limit that Hawking had predicted in 2016.

According to Hawk ing in his BBC science series, Tomorrow’s World, climate change, overdue asteroid strikes, epidemics and population growth are to blame for the new century-long doomsday clock.

Humans Have To Colonize Another Planet ASAP

In a BBC documentary released earlier this year, titled Stephen Hawking: Expedition New Earth, the physicist explained his prediction that soon, the human species will have to leave Earth and repopulate somewhere else in the universe, either on a spacecraft or on another planet.

The physicist warned that if humans don’t become a multi-planetary species and settle on other worlds, our species could die out within the next century.

Hawking first proposed this grim prediction in 2016, but revisited it again this year with supporting facts on why he believes the prediction could actually come true.

“Although the chance of a disaster on planet Earth in a given year may be quite low, it adds up over time, becoming a near certainty in the next thousand or ten thousand years,” explained Hawking in the documentary, Weather.com reported.

Earth Will Glow Red And Become As Hot As Venus

In July, Hawking told the BBC that humanity is at a “tipping point” where global warming would become so bad that Earth will “become like Venus, with a temperature of 250 degrees celcius, and raining sulfuric acid.” Sounds lovely.

Venus is the second-closest planet to the sun, and, as far as scientists are concerned, life there is impossible. Hawking also predicted that humanity’s natural greed would impede us from being able to properly address global warming, and that our best bet is to leave Earth completely.

By 2600, Earth Will Not Be Able To Keep Up With Population Growth

In November of this year, at a Tencent WE Summit, an annual forum where top scientists and professionals gather to share ideas on science and technology, Hawking predicted that due to the increasing human population, by 2600, the world’s electricity consumption will make our once-blue planet glow fire-red, Geek Wire reported.

According to Hawking, the global population has been doubling every 40 years, and our planet can only take so much.

“This exponential growth cannot continue into the next millennium,” explained Hawking, Geek Wire reported.”By the year 2600, the world’s population would be standing shoulder to shoulder, and the electricity consumption would make the Earth glow red-hot.”

AI Will Replace Humans And Take Over The World

In 2017, Stephen Hawking has been quite vocal with his concerns regarding robots and artificial intelligence. This November, Hawking explained he believes that AI will reach a point where it will ultimately become a completely new form of life that will outperform and eventually replace humans, CNBC reported.