Earth has completed nearly half of its lifespan, as per scientists. The 4.5-billion-year-old planet is expected to survive for about 9.5 billion years. “Our Earth will 'die' in multiple ways,” said University of Bordeaux astrophysicist Sean. He said Sun will gradually brighten, vaporising oceans and making Earth uninhabitable. Later, as Sun expands into a red giant, it may swallow Earth.