Re: NASA
If your point is that, as large mammals, humans would be wiped out by a Chicxulub-like collision, I'm not convinced. Humans are currently spread all around the globe, able to withstand a large range of temperatures and inhospitable conditions and generally quite adaptable. Even if 95% of the human race was destroyed, I'm pretty sure you'd see societies rebuilt within a few decades.
Biting the hand that feeds IT
