Sign up to see the future, today Can’t-miss innovations from the bleeding edge of science and tech Email address Sign Up Thank you! It’s admittedly extremely far-fetched, but it’s a fun thought experiment that he argues could result in Earth staying habitable for another “9.1 million billion years.” “We’d need to cover a huge 70-degree area of the sky to ensure the red giant would be eclipsed,” he wrote. It would indeed be immense: it’d need to be roughly 434,000 miles in radius, tied to a carbon tether 1.2 million miles in length. More on the Sun’s death: Earth Will One Day Die, But We Could Survive By Moving Here