Water bear insects can survive for 30 years without eating or drinking, can withstand high temperatures of up to 150 degree, and can survive in deep seas and icy space  Their amazing survivability enables them to survive the extinction of most life on earth the only force that can harm the water bear is a star explosion or a gamma-ray burst
Water bears will not encounter star explosions or gamma-ray bursts before the sun perishes
 Some experts have concluded that the water bear is a kind of earth creature that can survive until the day the sun perishes