How will the universe end? Discuss.(I am in the discussion too)
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The science is much less settled on how that will happen. We're not even
sure if the universe will come to a firm, defined end, or just slowly
tail off. Our best understanding of physics suggests there are several
options for the universal apocalypse. It also offers some hints on how
we might, just maybe, survive it.
airmech:
do u need more
There is no theoretical proof that we survive, as the stardust will simply get less and less; until the universe is filled with black holes, black dwarves and end with heat death i.e the universe balances entropy. Right?
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There are several possible fates of the Universe.
The research into this area started getting popular after Edwin Hubble showed that our Universe was expanding.
As the Universe is expanding, it must have been a point at some early time. That we call as the Big Bang. As the Universe is supposed to have a beginning, it was also supposed that it will have an end.
The fate of the Universe depends on the rate of expansion.
There are a few possible cases:
1) If the rate of expansion is less than a critical rate, then at some point of time in the future gravity will overpower expansion. And then, the Universe will start contracting again. And possibly, it will collapse back to a point. This theory is called The Big Crunch.
It can happen if the rate of expansion is decreasing.
2) If the rate of expansion is more than the critical rate, then as distance between objects increases, their gravitational interactions decreases. So, the universe keeps expanding faster and faster. At some point of time, the rate of expansion will become so high that atoms will be torn apart.
Literally, everything will be torn apart. This theory is called The Big Rip.
3) If the rate of expansion is such that it would just balance out gravitational interactions, then the universe could keep expanding forever, at a more or less uniform rate.
Slowly, the stars would die. Gradually all the sources of light will get diminished. What will remain will be the white dwarves, neutron stars, some black holes, etc. Thus, everything would go cold.
This theory is called The Big Freeze or Heat Death
___________________________________________________________
The current rate of expansion of the universe has been measured, and it's called the Hubble Constant.
Hubble Constant H₀ = 67.15 ± 1.2 (km/s)Mpc
This means that for every million parsecs of distance from the observer, the rate of expansion increases by 67 km/sec
The research into this area started getting popular after Edwin Hubble showed that our Universe was expanding.
As the Universe is expanding, it must have been a point at some early time. That we call as the Big Bang. As the Universe is supposed to have a beginning, it was also supposed that it will have an end.
The fate of the Universe depends on the rate of expansion.
There are a few possible cases:
1) If the rate of expansion is less than a critical rate, then at some point of time in the future gravity will overpower expansion. And then, the Universe will start contracting again. And possibly, it will collapse back to a point. This theory is called The Big Crunch.
It can happen if the rate of expansion is decreasing.
2) If the rate of expansion is more than the critical rate, then as distance between objects increases, their gravitational interactions decreases. So, the universe keeps expanding faster and faster. At some point of time, the rate of expansion will become so high that atoms will be torn apart.
Literally, everything will be torn apart. This theory is called The Big Rip.
3) If the rate of expansion is such that it would just balance out gravitational interactions, then the universe could keep expanding forever, at a more or less uniform rate.
Slowly, the stars would die. Gradually all the sources of light will get diminished. What will remain will be the white dwarves, neutron stars, some black holes, etc. Thus, everything would go cold.
This theory is called The Big Freeze or Heat Death
___________________________________________________________
The current rate of expansion of the universe has been measured, and it's called the Hubble Constant.
Hubble Constant H₀ = 67.15 ± 1.2 (km/s)Mpc
This means that for every million parsecs of distance from the observer, the rate of expansion increases by 67 km/sec
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