In the case where the Universe is going to

end would correspond to w less than minus 1.

So if w is less than minus 1, then what happens with this is that, well,

this is less than minus 1, it's less than, zero.

So then minus

with this exponent is positive now. So as the Universe expands, energy

density actually grows and that would be the consequence of w less than minus 1.

So is, if the energy density grows the Universe expands you just

keep feeding it more and more energy that pushes the expansion even further.

And, that will eventually lead the Universe into

a Big Rip, so that expansion becomes so fast,

that even the galaxies, or stars, eventually

even atoms and nucleus get ripped apart,

and the Universe becomes totally ripped apart

and completely empty and then boom, it ends.

You can't even think about what happens next.

Universe ends with infinite speed of expansion, and so

that is sort of like the end of the Universe.

On the other hand, if w were slightly bigger than

minus one, this is a situation very much like

what happened at the beginning of the Universe, namely, inflation.

So by measuring this equation state parameter this holds the key to predict

the fate of the Universe and that's what we would like to measure.

So let me show you one video clip here

which is the computer graph, animation that shows what

a Big Rip might look like.

So many, many billions of years from now, if we head to a

Big Rip, then this might what happens 200 million years before the big rip.

Dark energy becomes so important and so multiplying

That it's whipping effect will start whipping the

galaxy as a whole, so the galaxy would

no longer be together despite the pull provided

by dark matter.

Dark energy wins over dark matter, and

then universe, the galaxy gets ripped apart into

individual stars, and even the solar system, the

planets started getting whipped away from the sun.

Once we head even closer to the big rip. So individual planets are now

ripped off from the sun, and if you get to only a few hours before the Big Rip,

that energy becomes so large and important that it

even rips the sun apart into smithereens, into individual atoms.

And of course it's not supposed to put use of sound like this.