3. What does the authore say will be the fate of human beings ? Why

NASA estimates that there are between 1,000 and 4,000 asteroids at least 1 kilometer in diameter which regularly cross Earth’s orbit, if such an asteroid hits the Earth once every 300,000 years, this gives the average person roughly a one in 4000 chance of being around when it happens, A small risk, may be, but much bigger than the risk of dying in an air crash, which is one is 20,000. If this happens in future clearly it would be a fate of human beings.