Confirmed by science: our species is doomed.

[BillZBubb]

58. You greatly underestimate the possibilities and the risks.

For instance, a nearby supernova birth, if we are in the path of the gamma ray burst, would wipe out the human race in less than two days. There would be no warning. There would be no time to prepare, and frankly no hope even given years to prepare.

As for an asteroid impact, that may or may not wipe out humanity depending on the kinetic energy involved. A massive enough asteroid would cause extinction.

A full scale nuclear conflict also could kill us all off. The initial exchange would not. Subsequent radiation effects would kill off a large number of those left and weaken the rest. The nuclear winter created by the blasts would destroy vegetation on most of the planets surface for years. Few would survive that, and those who did would face long odds of creating a successful future generation.