Stephen Hawkings 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. Thanks to modern day healthcare, 100 years is nearly a lifetime, but this May, 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.

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