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  • Hey there. Welcome to Life Noggin!

  • The Earth is huge--its surface area is over 500 million square kilometers

  • and it currently holds over 7 billion people.

  • But it's nothing compared to the solar system, which is billions of kilometers across.

  • And that is still nothing compared to the Milky Way galaxy.

  • And if we zoom out even more, we can really start to appreciate how huge the universe actually is.

  • But we might be able to take this one step further -- because we might be living in something called a multiverse,

  • where there is not just one universe, but potentially an infinite amount of them.

  • And if this is true, some scientists think that we have the Big Bang to thank.

  • See, for a fraction of a second after the Big Bang, the universe expanded incredibly quickly and then stopped.

  • And over the next 14 billion years, it cooled down and formed stars, galaxies, and eventually life!

  • But there's reason to believe that there are some pockets of space that haven't stopped inflating,

  • and some others that have at different times. This is called the "eternal inflation" theory,

  • and each of these bubbles of space forms its own, isolated universe.

  • Maybe in another universe, I'm really buff and strong. Okay, I'm not gonna get carried away.

  • And interestingly, the laws of physics and the fundamental constants might not be the same here.

  • And that got me thinking: what would a parallel universe even be like?

  • Well, in a lot of these universes, you and I might not even exist -- sorry sci-fi fans, I know that's hard to hear.

  • See, if the laws of physics were different enough -- like if the forces between particles were too weak,

  • atoms might never form.

  • And that means no molecules, no stars and planets, and no life.

  • Sounds pretty boring over there -- worst vacation spot ever!

  • That said, there's also the possibility that the laws of physics in some of those universes are so close to ours that intelligent life is possible.

  • And if there is an infinite amount of them, it's pretty likely that there's a bubble universe that's very similar to our own.

  • And interestingly, it is theoretically possible that some of these neighboring universes can collide with each other.

  • In fact, it's possible that our universe may have collided with others in the past.

  • The main hypothesis is that a collision like this might have left a mark on the cosmic microwave background that we can detect.

  • But sadly, the researchers haven't found anything so far,

  • and there isn't any proof that parallel universes even exist.

  • But if they do, and if they contain life, it would be interesting to see what that life was like.

  • What do you think ?

  • Do you believe that parallel universes are out there?

  • Let me know in the comments!

  • And if you want to know why we haven't found life in our galaxy yet, click here to find out.

  • There's a link in the description if you're on mobile.

  • As always, I'm Blocko.

  • This has been Life Noggin.

  • Don't forget to keep on thinking.

Hey there. Welcome to Life Noggin!

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What Would A Parallel Universe Even Be Like?

  • 24232 1980
    g2 posted on 2016/10/26
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