I'm working on the basis, probably naive, that once the most dense and avaricious black hole has swallowed everything else up it will be so utterly dense in there it all just has to go bang and start all over again.
All that energy has to go somewhere after all.
That's sort-of what Roger Penrose proposes
But of course much of it is hypothetical, and there are numerous other theories.
But, much like with Einstein's theories and resulting equations- His equations showed that black holes should exist in the universe. At the time he considered it so ridiculous he thought his equation wasn't quite right and needed modification - but now we know it was right. He also predicted gravitational waves - literally a warp in spacetime. About 10yrs ago we discovered them travelling through the Earth.
Time will come when we will be able to test theories such as those of RP, so little by little we uncover the layers.
Billericay - Essex
Knowledge is knowing that a tomato is a fruit. Wisdom is not putting it in a fruit salad.
And what about time? What is it, exactly? We, as humans, have divided up time as we understand it, into years, months, weeks, days, hours, minutes, seconds, milliseconds, etc. But, really, is it the linear thing we have created for ourselves, or is it something much more complex?
And what about time? What is it, exactly? We, as humans, have divided up time as we understand it, into years, months, weeks, days, hours, minutes, seconds, milliseconds, etc. But, really, is it the linear thing we have created for ourselves, or is it something much more complex?
Yes a very interesting question. Time is not linear throughout the universe. As far as we are concerned on Earth it is, but acceleration changes the speed at which time passes according to the rules in Einstein's Theory of Relativity which in itself is awesome.
A recent experiment with lasers showed that the output of an experiment could influence the input of that experiment before the experiment took place! In the quantum world the arrow of time does not need to only run in one direction.
There is an excellent book on the subject - The Order of Time by Carlo Rovelli. Full of mind-blowing stuff and no equations thankfully. Maths is not my strong point!
Billericay - Essex
Knowledge is knowing that a tomato is a fruit. Wisdom is not putting it in a fruit salad.
I had the same thought as @Obelixx before - re the last black hole standing starting it all again. Amazed to hear that it is being considered as possible by an actual scientist. What boggled my mind about this quasar, is how far away it is for scientists not to have realised how huge it is until now. The distances quoted make my brain seize up. One of my favourite QI moments was Stephen Fry (I think not Sandi Toksvig), trying to persuade Phil Jupitus that once you see the sun touch the horizon, it has already set and gone, and Phil wailing “but it’s there!”. Nope, it was there 8 minutes and 20 seconds ago. I think of that at every sunset.
Carmarthenshire (mild, wet, windy). Loam over shale, very slightly sloping, so free draining. Mildly acidic or neutral.
The universe is amazing - the thought that a black hole may be at the centre of each galaxy is intriguing enough. What I still find strange is why galaxies seem to form on a plane - I would have expected the 'stuff' that makes up a galaxy to be spherical if anything - especially if a black hole is in the centre and gravity work in all directions. Why flat on a plane - spin? - and if spin, why do things spin in the first place?
In fact some galaxies are spherical, not planar. Saturn's rings happen because particles that orbit out of the plane will hit other particles in the plane, so their vertical motion is reduced and their orbits move closer to the plane. Soon all the particles end up in the same plane. it is the same with the gas in a galaxy when it first forms, producing flat galaxies. Spherical galaxies are thought to be the result of several galaxies merging, where the same effect does not work.
There are a number of misconceptions about Cosmology. The Big Bang did not occur at a single point, it happened everywhere. The universe has always been infinite in size, it has never been very small. And there is no reason to believe that time has a beginning, there is reason to believe that it has no beginning and no end. https://www.preposterousuniverse.com/blog/2019/01/12/true-facts-about-cosmology-or-misconceptions-skewered/
I know nothing about the Universe (or science in general for that matter (pun intended)) that I haven't got from Brian Cox, Jim Al Khalili etc...but doesn't your rings of Saturn comment work from that basis - ie that the rings already existed? But why did THEY form in a plane? I think, after a Brian Cox prog, I googled gravity as I had assumed that planetary spin caused a bulge in the planet at the equator and the extra mass (and therefore gravity) around the equator was then the cause - but, I think I read that gravity around an equator is less. I can't recall the ins and outs, but I gave up at that point!
As for time - again I know nothing here - didn't Einstein say that time and space are inextricably linked - space-time - and maybe I'm being thick here (as usual), but doesn't that link space and time to E=MCC (no, not the cricket club) , given that you can't have 'speed' without distance and time?
Way back, I read an odd little book called The Kybalion that put forward the idea that All Is Mental - that everything we perceive is a mental construct of a higher being. Much the same as we create in our heads before we create physically - we are a product of an infinite mind and exist as a mental process of that mind.
Saturn's rings are thought to have begun when a moon got too close to the planet and was torn apart by gravity. Afterwards the fragments repeatedly collided, and when two particles collide their orbits become more similar and they end up moving in the same orbit.
Not sure what your second paragraph is trying to say. Space and time are linked, Einstein multiplied time by speed (the speed of light) to give a distance, so you can think of spacetime (one word) as comprising four dimensions of space.
Posts
But of course much of it is hypothetical, and there are numerous other theories.
But, much like with Einstein's theories and resulting equations-
His equations showed that black holes should exist in the universe.
At the time he considered it so ridiculous he thought his equation wasn't quite right and needed modification - but now we know it was right.
He also predicted gravitational waves - literally a warp in spacetime.
About 10yrs ago we discovered them travelling through the Earth.
Time will come when we will be able to test theories such as those of RP, so little by little we uncover the layers.
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
Time is not linear throughout the universe.
As far as we are concerned on Earth it is, but acceleration changes the speed at which time passes according to the rules in Einstein's Theory of Relativity which in itself is awesome.
A recent experiment with lasers showed that the output of an experiment could influence the input of that experiment before the experiment took place! In the quantum world the arrow of time does not need to only run in one direction.
There is an excellent book on the subject - The Order of Time by Carlo Rovelli.
Full of mind-blowing stuff and no equations thankfully.
Maths is not my strong point!
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
Saturn's rings happen because particles that orbit out of the plane will hit other particles in the plane, so their vertical motion is reduced and their orbits move closer to the plane. Soon all the particles end up in the same plane.
it is the same with the gas in a galaxy when it first forms, producing flat galaxies. Spherical galaxies are thought to be the result of several galaxies merging, where the same effect does not work.
The Big Bang did not occur at a single point, it happened everywhere.
The universe has always been infinite in size, it has never been very small.
And there is no reason to believe that time has a beginning, there is reason to believe that it has no beginning and no end. https://www.preposterousuniverse.com/blog/2019/01/12/true-facts-about-cosmology-or-misconceptions-skewered/
https://www.youtube.com/watch?v=lMtXfwk7PXg
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
Saturn's rings are thought to have begun when a moon got too close to the planet and was torn apart by gravity. Afterwards the fragments repeatedly collided, and when two particles collide their orbits become more similar and they end up moving in the same orbit.
Not sure what your second paragraph is trying to say. Space and time are linked, Einstein multiplied time by speed (the speed of light) to give a distance, so you can think of spacetime (one word) as comprising four dimensions of space.