7. C. 5,000,000,000: Generally Accepted Scientific Theory
Even scientists believe that nothing can last forever, including our planet. But don’t start prepping for doomsday just yet — that probably won’t happen for another few billion years. So what will judgement day look like? Well, the sun will continue to get brighter: raising the temperature on earth, evaporating the world’s oceans, depleting carbon dioxide and generally making the earth uninhabitable.