Water bears can survive for 30 years without eating or drinking, can withstand temperatures up to 150  degree and can live in the deep sea and cold space  Their amazing ability to survive enables them to avoid the catastrophe that wiped out the vast majority of life on Earth  The only forces that can hurt water bears are stellar explosions or gamma-ray bursts
Water bears will not encounter stellar explosions or gamma-ray bursts until the sun dies
 Some experts assert that the water bear bug is an earth creature that can survive until the end of the sun