You ever need a vacation?

Like a real escape?

And not just somewhere exotic, like a tropical paradise or a mountain retreat, or even another planet.

No, you don't want to float through the storms of Jupiter or bounce around on Pluto.

Okay, maybe you do, but that's, you want to go even bigger.

You don't even want to go to another galaxy.

No, have you ever had that urge to just quit the universe entirely?

Go to an alternate reality, a parallel timeline, experience another

existence entirely? Well, it's going to be tough. But hold on, while my usual MO in this show

is to reign on everybody's parade and say that all the cool stuff from sci-fi is implausible

or not well justified or

just plain doesn't work. In this case, I'm going to leave open a tantalizing possibility. It's just a

tiny one, but it's still there. Because when it comes to parallel universes and getting there, there's a slight.

And trust me, that word is doing a lot of heavy lifting in this sentence,

Slight possibility.

Which makes it really, really fun to talk about.

First off, if we've packed our bags and decided that we want to travel to a parallel universe,

it's not like we can just go to our favorite airline and book a ticket.

We need to know where the alternate universe is so that we can, you know, go there.

Thankfully, physics has our back.

And if parallel universes exist, then we know exactly where they are.

And they are really, really far away.

...