The fate of the Universe
I already posted about the beginning of the Universe and wrote also on its end. Let me add something more on it (it’s not my field).
The consensus about the fate of the Universe is moving into the Big Rip or the Big Chill. And that is good, since the Big Crunch would be the worst of the scenarios.
The precise numbers change from author to author, but the numbers about the composition of the Universe are more or less around these:
Normal stuff: 4.9% (the numbers go around 4.6 and 4.9%: mostly, 4%, are hydrogen and helium; with stars amounting to about 0.5% and neutrinos for approximately 0.3%).
Dark matter: 25% (the estimations oscillate between 22% and 27%).
Dark energy: 70% (the opinions swing between 66% and 73%).
See, accessible:
https://en.wikipedia.org/wiki/Universe#Contents https://www.spacetelescope.org/science/composition_of_universe/ http://space.about.com/od/astronomybasics/a/Composition-Of-The-Universe.htmThis composition changed during the life of the Universe. It seems that dark energy has been gaining preponderance.
Clearly, now it is this energy that is controlling the Universe.
Basically, the specialists only know well regular matter. They know little about dark matter and know almost nothing about dark energy.
It’s known that dark matter responds to gravity and constitutes the back bones of the Universe, around which galaxies are formed (with a strong help from black holes, since every galaxy seem to have one on its centre).
So, dark matter is what keeps galaxies united.
However, what is controlling things now is dark energy and it has the contrary effect. This energy is pulling apart galaxies.
It seems that some time ago the velocity of the expansion of the Universe was decreasing.
But, currently, the Universe is expanding faster, because of the increase of dark energy.
Therefore, once, the Universe was dominated by dark matter, but now is controlled by dark energy.
The issue is still debated (it depends on the intensivity of dark energy, on the reason for its increase and its rate and possible limit), but now specialists are saying that the galaxies will expand faster and faster.
Some controversial calculations point out for 22 thousand millions years from now as the date of the Big Rip.
In due time, if humankind is still here, our descendents will only see the stars of our galaxy, Milky Way, on the night sky. All the other galaxies will be out of sight.
Then, at about 60 millions before the Big Rip, even our Milky Way will be ripped apart. All solar systems would follow the same path a few months before the final Rip.
On that time, our Solar System won’t probably be here.
Our Sun will start expanding and destroy all life on Earth on one or two thousand million years and will explode on about five thousand million years.
But these are not the only problems, even if the Solar Systems could resist the growing speed of expansion, it’s also confirmed that the Universe is dying.
The number of stars created has been diminishing. One day, the Universe will be a dark place, because, one by one, stars will die and less and less ones will be created.
So, what can kill us first? The Big Rip, caused by the speed of expansion of the Universe, or will it be the Big Chill, provoked by the slow death of the Universe?
From a natural perspective, one or both of these situations seem inevitable.
But no need to feel gloomy about this.
A touch of human magic might be possible.
If we won’t screw up and end destroying ourselves, we know for sure that we shall be very far from this planet and solar system long before the end of the Sun.
And, if we accept the theory of the Multiverse (saying that there are other universes besides this one) we might also find a way out of this Universe long before he fails us.
Michio Kaku argues that it's (theoretically) possible to create a wormhole to another universe.
Nothing like keep hoping for some meaning by dreaming we “can” endure forever (we won’t, because forever never ends).