What could happen to our Universe: Big Bounce

with little break from Solar System I am returning to last post about end of our Universe. This time it is very optimistic, but we will die anyway..

Right now the Universe is expanding, it is expanding in high speeds but this theory is assuming that this process due to decreased amount of dark energy reverses at one point and everything will start to shrink back. This would heat Universe over time. About 100,000 years before big crunch space would be hotter than surface of stars which would make them cooked from outside (FUN).

Then all matter would fall into black holes and all of those black holes would fall into each other so that final singularity would be created.

Well then it could start all over again, big bang, zero expansion and big crunch. This scenario also assumes that Universe is going through infinite cycles of banging and crunching. While this is most optimistic, in the new Universe would be nothing from the one before.
Measuring of expansion of Universe does not give much points to big crunch because now it seams that expansion is speeding up. Scientists are not yet able to know why is this happening Big Bounce is still an option.


PS: I just lost the game… Here is post about heat death. And here about big rip.

Schwarzschild radius

I know this title seems that my post will be complicated but actually it is pretty easy.

I want to return to my favourite topic: Black holes, and their size.
You probably know that inside black hole is singularity and that the edge is called event horizon. Its size is different from one black hole to another and we can use Schwarzschild  radius (SR) to count it.
Schwarzschild radius is area from which light could not escape if you pressed this mass to area of sphere with Schwarzschild radius.
Its equation is:
r=2Gm/c^2 where r is radius, G is gravitational constant, m is mass of object, c is speed of light.
Earth´s SR is 9mm and Sun´s is 3km and if you would compress mass of observable Universe you would have SR of 13,7 billions of light years and super massive black hole in the middle of Milky way has Schwarzshild radius 7,8 millions of km which is also how big is its event horizon.