Black holes..

Oddly the Indian scriptures have been saying this for thousands of years. They call it the Days and Nights of Brahma.

"Hindu religious scriptures such as the Vedas and Purāṇas describe a massive range of units of Kāla measurements, spanning right from Paramāṇu (time length of about 17 microseconds) to the Mahā-Manvantara (311.04 trillion years). According to these texts, the creation and destruction of the universe is a cyclic process, which repeats itself forever. Each cycle starts with the birth and expansion (lifetime) of the universe equaling 311.04 trillion years, followed by its complete annihilation (which also prevails for the same duration) which is done by Lord Shiv(Bholenath) ."


How did they get that info? :confused:
 
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why would gravity stop the big bang? It doesn't stop spacecraft reaching earth orbit, or beyond.
Click to expand...

Because one thing we know about singularities is that there's an awful lot of gravity there. That's why black holes are black, light can't escape the singularity at the centre. If it acts like that in ordinary little black holes, (which also mash all the known laws into nonsense) and which can be made from the remains of one single star, why wouldn't it do the same in a situation where all the mass of the universe is condensed into a tiny volume? That's the question.
A spacecraft wouldn't reach orbit round a black hole from the surface, no matter how powerful.
 
How can there be a surface on a singularity?
 
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Good point, let's say it wouldn't reach orbit from inside the event horizon.
 
joe-90 said:
Oddly the Indian scriptures have been saying this for thousands of years. They call it the Days and Nights of Brahma.

"Hindu religious scriptures such as the Vedas and Purāṇas describe a massive range of units of Kāla measurements, spanning right from Paramāṇu (time length of about 17 microseconds) to the Mahā-Manvantara (311.04 trillion years). According to these texts, the creation and destruction of the universe is a cyclic process, which repeats itself forever. Each cycle starts with the birth and expansion (lifetime) of the universe equaling 311.04 trillion years, followed by its complete annihilation (which also prevails for the same duration) which is done by Lord Shiv(Bholenath) ."



How did they get that info? :confused:
Click to expand...

According to the latest observations the expansion of the universe is accelerating not slowing down. Which means it will go on expanding forever, driven by a force which they are calling dark energy which is said to account for about 73% of the energy mass density of the universe.
So those indians ain't so smart.
 
The latest observation doesn't mean a lot does it? Like looking at the weather out of the window. Dark energy? Dark matter? They are making the facts fit the crime. Hope they don't become coppers. Gravity will eventually halt and pull back the rogue stars and the whole bubble will contract back to nothingness and do it all again and again for eternity. No-one will ever know why or how.
 
The latest observations have been made with the latest satellites, and the latest detectors, which are obviously more sensitive and can see things previous detectors and satellites couldn't. So they do mean something, but even before the accelerating expansion was discovered it was known that there wasn't enough known mass in the universe to cause it to contract again. It was thought at the time that there was only about 10 % of the mass needed to do that and it would only slow the expansion down a bit. The discovery of the acceleration took all the scientists by surprise.
But one thing seems certain, the idea of a cyclical universe has gone out of the window.
 
No doubt it will be back when someone looks to get a research grant.

BTW whatever happened to string theory?

Oh and in 13 billion - how many naughts is that?
 
String theory is still around, I think there's about six different versions of it depending on how many dimensions you fancy.
I was reading a book a few years ago by some geezer who reckoned that there were 11 dimensions and tied it up with something called inflation which according to him explained how the universe jumped from next to nothing to huge size in nano seconds.
 
sooey said:
why would gravity stop the big bang? It doesn't stop spacecraft reaching earth orbit, or beyond.
Click to expand...

Because one thing we know about singularities is that there's an awful lot of gravity there. That's why black holes are black, light can't escape the singularity at the centre. If it acts like that in ordinary little black holes, (which also mash all the known laws into nonsense) and which can be made from the remains of one single star, why wouldn't it do the same in a situation where all the mass of the universe is condensed into a tiny volume? That's the question.
A spacecraft wouldn't reach orbit round a black hole from the surface, no matter how powerful.
Click to expand...


Actually now thinking my question doesn't apply as the big bang caused a massive expansion of space-time so unlike something just moving from one place in relatively stable space to another. Newtonian mechanics wouldn't apply until it was too late to stop things such was the energy of the initial event.
 
You need to get a new shrink. You're still obsessing about me, lovely though I am I've already told you there's nothing doing so live with it. :rolleyes:
 
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