“Whenever you have infinities in a theory, that’s where the theory fails as a description of nature. And if space was born in the Big Bang, yet is infinite now, we are forced to believe that it’s instantaneously, infinitely big. It seems absurd.” -Janna Levin
Of course, we don’t believe space was born in the Big Bang, but this wasn’t intuitive for a long time! Indeed, given the cosmic unknowns of inflation, dark matter and dark energy, and the fact that what we consider to be “normal matter” only makes up around 5% of the total amount of energy in the cosmos, isn’t it time to revisit the Big Bang?
This week’s Ask Ethan forces us to ask some very tough questions: in particular, if these new discoveries don’t cast doubt on the Big Bang itself! In particular (excerpted):
How is it possible to extrapolate back to the big bang, when so little of the matter and force in the universe is understood?
Come and get the answers here.