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Michio Kaku - How Big Can the Cosmos Get?

The universe seems to be infinite until you hit a second wall and the universe is infinite . michio 100 125 years ago best scientists thought that the entirety of the universe maybe a couple thousand three thousand light years and then every decade it seemed in the 20th century the universe got bigger and bigger .

Today we think that perhaps our universe may be three dimensional you go in a straight line and you never hit a brick wall but perhaps just perhaps you come back to where you started from if I had a telescope perhaps the farthest object you can see is the back of your head because perhaps light went all the way around the universe .

Evidence we have today shows that the universe seems to be flat we ca n't detect with our instruments of curvature but that could mean that our ball our bubble is just very very big and we 're just like bugs bugs on a piece of a bubble and all we can see is the horizon is flat .

String theory takes you before the Big Bang to the pre Big Bang era and that 's where all the action is today many of my colleagues are proposing different kinds of pre-Big Bang scenarios . We hope to test them with our next generation of space satellites now what the implications of that would be is if there is pre- Big Bang which means we 're not the first which means there 's other stuff other space-time other things out there beyond that .

The universe popped into existence as a quantum fluctuation of nothing if you take a look at our universe for example it has no spin it 's quite remarkable you add up all the spins of the galaxies they sum to 0 . Maybe that 's because we came from nothing nothing also has zero net charge . There 's almost an exact cancellation between matter and antimatter .

In the next decade we will have snapshots of the infant universe and perhaps we 'll have evidence of an umbilical cord connecting our baby universe to a parent universe in the same way that a soap bubble can give rise to baby soap bubbles . If we find that what are the implications of that in terms of the extent of all reality all that is it means that we have to have a physics that goes beyond just our universe .

If we have a soap bath a bubble bath of universes each universe has its own clock so if we look at the bubble bath we are outside time . God has to be on the other side of the galaxy right now is he a prisoner of time like us or is the outside of time?

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Source : https://youtu.be/S_Vu8a0MLaQ

#science #universe