What is the Universe expanding into..

[Bonsai]

Nice to see those positive comments! 😉

The full workings for the mass growth, surface area and mass growth are given in the video. Entropy and temperature also dealt with briefly

All good stuff!

 

[Galu]

Looks like I'll need to spare an hour to actually watch the video!

 

[TNT]

Can you give us a more relevant link to the concept of the Outerverse?

Such concept don't jive well with Universe / Observable Universe. "Universe" seem to cover it all - no?

Yes :-D

//

 

[TNT]

...
This hot and dense universe was not point-like. The young universe existed everywhere because the young universe was all that existed! ...

AOT!! Almost On Topic :-D

But now that it is a bit older, what exist in addition to the expanded universe? 🙂 an where is that? 😉

//

 

[TNT]

I suppose: "entire galaxies are moving faster than c"

Relativ to what?

//

 

[Galu]

But now that it is a bit older, what exist in addition to the expanded universe? 🙂 an where is that? 😉

That depends on which hypothetical cosmological bandwagon happens to be the flavour of the moment! 😉

 

[Galu]

I suppose: "entire galaxies are moving faster than c"

Relativ to what?

Please direct your question towards the contributor who made that statement.

I know naught of what you talk!

 

[Disco-Pete]

now, now

 

[Galu]

That's him! 😀

 

[Disco-Pete]

I suppose: "entire galaxies are moving faster than c"

Relativ to what?

//

In appearance only, apparently. Me doth protest.


I suppose the question is : if I'm riding in a car and a train passes me, it's relative speed is the difference. But how do I assess speed if I also observe someone running down the isle in the train?

 

[Galu]

As long as that someone is a relative, you'll have no problem!

 

[Disco-Pete]

Ah yes, the chickens!

 

[TNT]

That's him! 😀

For sure ;-)

//

 

[Disco-Pete]

How clever. Perhaps you should enlighten us? We wait with bated breath.









😉

 

[Galu]

Earlier, I talked about the density of a black hole i.e. the average density of the spherical volume within its event horizon.

I've found an interesting fact!

A billion solar mass black hole, the kind that lurks in the centre of galaxies, would have an event horizon 3 billion kilometres in radius. That's roughly the distance of Neptune from the Sun.

That would give the black hole an average density of roughly 1/1000 of a gram per cubic centimetre, which is comparable to the density of air!

Therefore, if you could enclose the solar system out at the distance of Neptune within a giant sphere, and fill it with air, the enclosed volume would have the equivalent density of a billion solar mass black hole! 😎

 

[benb]

I find it amusing that the topic of discussion here is black holes, while in "The Black Hole..." they're discussing amplifiers and speakers.

 

[Disco-Pete]

Earlier, I talked about the density of a black hole i.e. the average density of the spherical volume within its event horizon.

I've found an interesting fact!

A billion solar mass black hole, the kind that lurks in the centre of galaxies, would have an event horizon 3 billion kilometres in radius. That's roughly the distance of Neptune from the Sun.

That would give the black hole an average density of roughly 1/1000 of a gram per cubic centimetre, which is comparable to the density of air!

Therefore, if you could enclose the solar system out at the distance of Neptune within a giant sphere, and fill it with air, the enclosed volume would have the equivalent density of a billion solar mass black hole! 😎

How fast does material accelerate to the singularity once past the event horizon? Also, since the core is a singularity, what establishes the size of the BH? Is it the rate at which material enters?

 

[Bonsai]

I find it amusing that the topic of discussion here is black holes, while in "The Black Hole..." they're discussing amplifiers and speakers.

😀

 

[Disco-Pete]

I find it amusing that the topic of discussion here is black holes, while in "The Black Hole..." they're discussing amplifiers and speakers.

Yes but are you aware just how ironic this is? 🙂

 

[system7]

I earlier talked about Dr.PhysicsA.

TBH, he lost me with his Christoffel symbols and Kroenecker Deltas. I have always been useless at Algebra. 😱

Einstein Field Equations - for beginners! - YouTube

But happy days. I bought some new computer speakers.

Excellent result. This is the way forward. 🙂

My mother would summon me into her room on occasion. She admonished me that all my friends were "Nuts".

All I could say, was that if I dismissed my friends on the grounds of being "Nuts", I would have no friends at all. 😀