- #1

Stephanus

- 1,316

- 104

I have a question about the size of "singularity"

This question has already been asked here, Question about Schwarzschild radius

But what I want to know is this density thing that I'd like a confirmation.

Actually it's 2.9511896078372906 KM according to his... the sun has a Schwarzschild radius of about 3 kilometers. If we were to be squeezed the sun to that diameter, it would theoretically collapse into a black hole right?

http://hyperphysics.phy-astr.gsu.edu/hbase/astro/blkhol.html

1. But what if it were squeezed to 3.1 KM, the "sun" radius is still 3.1KM, right. It's density will be 18400 trillion of water.

**Can we, theortically, "measure" the sun with a ruler if it's radius is 3.1KM?**

Once it goes below 2.951 KM, it's radius will be 0 KM, singularity. Is that right?

2. Still according to Schwarzschild calculator, for an object (star? nebulae?) 1 G solar mass it's Scharwzshild radius is 2.95E9 KM. It's density is 1.84

**percent**that of water.

Did I make a mistake in my calculation?

If that objects is squeezed to 2.94E9, will it disappear and become a black hole?

3. Still using that calculator above. According to Wikipedia

The universe mass is 1E53Kg

So it's Schwarzshild radius is 1.48E26 metres. Dividing it by seconds/minutes/hours/days/years

I find this: 15.6 billion light years. And our universe is 13.6 billion years old. So??

Are we living in a black hole?

If the question number 1 and 2 are true, about "squeezing object below it's Schwarzshild radius", why aren't we squeezed into a singularity?

Did I make a mistake in my calculation, again?

4. Is it possible for a very massive object below it's schwarzshild radius, but doesn't become a black hole? Doesn't become a singularity?

Thanks for any explanation.