Recall from my previous post how we have three wildly disparate
time scales in play: millions, billions and trillions. Rounding to
the nearest 20, we have:
- Time for intelligent life to fill a galaxy: super short 20
- Time for intelligent life to evolve in a galaxy: moderate 20
- Time of universe to keep having stars: super long 20
The first perspective shift is to step back in time, and realize
the universe is very young. With 20 trillion years of star
generation ahead, the universe has only covered 13.7 billion years
or roughly .07% of its life span. Compare this to a person who
expects to live 70 years, and you’d get .07% * 70 years = roughly
18 days. So in human terms the universe is a three week old baby.
No wonder there’s not too much life out there yet.