Hey there and 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’s 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’s
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 it own, isolated universe.
And interestingly, the laws of physics and
the fundamental constants might not be the
same there.
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.
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.
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’s 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 could 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 the life would be like?
And do you believe that parallel universes
are out there?
Let me know in the comments!
If you want to know why we haven’t found
life in our galaxy yet, click here now.
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.
