“Youth is the gift of nature, but age is a work of art.” –Stanislaw Jerzy Lec
You’ve heard it said many times here: the Universe, since the Big Bang, is 13.8 billion years old. But how do we know this to be true?
Moreover, how many different lines of evidence do we have that leads us to this conclusion? Is it like it is for dark matter, where we have a whole slew of them? Or are there only one or two different things we can look at in order to know?
Decide for yourself after taking a look at all the evidence on this edition of Ask Ethan!