What will happen to Earth and the humans living on it in one billion years? – Humans will thrive and set up colonies deep in our galaxy or die trying!
Over time intervals of hundreds of millions of years, random celestial events pose a global risk to the biosphere, which can result in mass extinctions. These include impacts by comets or asteroids, and the possibility of a massive stellar explosion, called a supernova, within a 100-light-year radius of the Sun; known as a near-Earth supernova.
