Black Holes .

[river]

You've been answered many times. I previously gave you an answer.

I told you that black holes form from collapsing stars. So, those black holes are "based on" star-stuff - their mass is the mass of all that hydogen and helium and stuff that fell in.

So your saying that our galaxy , the centre of our galaxy , has no black hole within it .

 

[DaveC426913]

So your saying that our galaxy has no black hole within it .

He is not saying that.
Our galaxy does have a black hole at its centre. A supermassive one of a bout 6 billion solar masses.
It was formed by the gobbling of millions of stars over our galaxy's lifetime.

 

[river]

New
↑
So your saying that our galaxy has no black hole within it .

He is not saying that.
Our galaxy does have a black hole at its centre. A supermassive one of a bout 6 billion solar masses.
It was formed by the gobbling of millions of stars over our galaxy's lifetime.

What is the essence of the black hole ?

To your last statement ;

Why ?

 

[DaveC426913]

What is the essence of the black hole ?

What do you mean by essence? That's not a very scientifically well-defined term.

For me, the essence of a black hole is compactified mass.

To your last statement ;
Why ?

Why what?
Why was it formed by gobbling millions of stars?
Science does not attempt to answer 'why' questions. That's for the philosophers.

 

[river]

What started the " gobbling " of stars ?

What is the essence of this " gobble " ?

 

[DaveC426913]

What started the " gobbling " of stars ?

Likely a supergiant star ran out of fuel and collapsed on itself.
Without the outward force of radiative pressure, any star larger than about 3 solar masses will collapse into a black hole.

What is the essence of this " gobble " ?

Gravity, friction and collisions.

 

[river]

Likely a supergiant star ran out of fuel and collapsed on itself.
Without the outward force of radiative pressure, any star larger than about 3 solar masses will collapse into a black hole.


Gravity, friction and collisions.

To your second last statement ; gravity based theory .

 

[DaveC426913]

To your second last statement ; gravity based theory .

Not sure what part you think is theoretical.
We certainly know gravity exists.

And we certainly know black holes exist. Here's one now:

And we certainly know that black holes are both massive and compact, meaning gravity very close to them is very strong.
We observe this.

Here is an image from the centre of the Milky Way:

We know how massive the central object is, based on the period of the orbits of the stars nearby.
We know how small it must be, based on the closest approach of the stars nearby.
We know of no known material that can be that dense without it collapsing on itself.

 

[river]

river said: ↑
To your second last statement ; gravity based theory .

Not sure what part you think is theoretical.
We certainly know gravity exists. And we certainly know black holes exist.
And we certainly know that black holes are both massive and compact, meaning gravity very close to them is very strong.
We observe this.

Here is an image from the centre of the Milky Way:

We know how massive the central object is, based on the period of the orbits of the stars nearby.
We know how small it must be, based on the closest approach of the stars nearby.
We know of no known material that can be that dense without it collapsing on itself.

To your last statement ;

A three dimensional material .

 

[DaveC426913]

To your last statement ;

A three dimensional material .

All materials are three dimensional.

 

[river]

river said: ↑
To your last statement ;

A three dimensional material .

All materials are three dimensional.

Indeed

 

[DaveC426913]

Indeed

And they're not strong enough to withstand gravity of that magnitude. Thus: black hole.

 

[river]

And they're not strong enough to withstand gravity of that magnitude. Thus: black hole.

So three dimensions turns into two dimensions because of gravity .

 

[DaveC426913]

So three dimensions turns into two dimensions because of gravity .

What? No.
Where do you get 2 dimensions from?

 

[James R]

So your saying that our galaxy , the centre of our galaxy , has no black hole within it .

Did I write that somewhere?

No, I did not.

Stop trolling.

 

[James R]

So three dimensions turns into two dimensions because of gravity .

Stop trolling.

 

[paddoboy]

Did I write that somewhere?

No, I did not.

Stop trolling.

Stop trolling.

That fact has been obvious for years now, and is why I ignore this troll, who isn't interested in learning one iota.
Rightly or wrongly, the first person I have ever ignored on this or any other site.
It was made blatantly painfully obvious when he was previously banned from the sciences, so when I contributed articles or comments on mainstream science, he would cunningly and deceitfully, start another in the fringes on the same subject, simply so he could do his usual trolling and ignorant denial and that same particular issue.

 

[davewhite04]

That fact has been obvious for years now, and is why I ignore this troll, who isn't interested in learning one iota.
Rightly or wrongly, the first person I have ever ignored on this or any other site.
It was made blatantly painfully obvious when he was previously banned from the sciences, so when I contributed articles or comments on mainstream science, he would cunningly and deceitfully, start another in the fringes on the same subject, simply so he could do his usual trolling and ignorant denial and that same particular issue.

What is trolling?

 

[davewhite04]

Where is the other end of the sun?

A black hole is a spherical object, kind of like the sun. It doesn't have an other end; it has a centre.

The Sun is a planet. Do you think a straw has a hole?

 

[DaveC426913]

The Sun is a planet.

The sun is not a planet.

What is trolling?

That is.