The universe is big, but it’s peanuts compared to the eternally inflating multiverse. But just how many universes are there? What are they like? And most importantly, what can they tell us about … aliens?

Imagine it: the observable...

Crash Course Big History is back! It turns out, we couldn't tell all of the 13.8 billion years of the history of the universe in 10 Crash Course Episodes. So, Big History host Emily Graslie has returned to add 6 more episodes that look...

What came before the Big Bang? what happened before the big bang? Since time is thought to have started at the big bang, asking what happened "before" is like asking what is North of the North pole? It may have no...

Summary:

The big bang model has some problems - homogeneity, flatness, and lack of magnetic monopo
les.
Cosmic Inflation occurred when the entire universe shortly after its beginning, expanded exponentially...

SUMMARY

The idea that there may be different versions of you comes from the concept of multiverses. There are many types of multiverses in physics. But at least two multiverse concepts based on generally accepted and...

Cosmologist Paul Steinhardt (Princeton) highlights a major issue with the theory of cosmic inflation - so-called "eternal inflation" that results in what theorists call a "multiverse".