I found an answer from www.history.com

Even Albert Einstein Had His Doubts About **Black Holes** - HISTORY

Apr 15, 2019 **...** **Black Holes** Were Such an Extreme Concept, Even Einstein Had His Doubts ...
More than a century ago, Albert Einstein stunned the world **when** he ... The theory
**not** only described the relationship between space, time, **gravity** and ... of **infinite**
**density**—onto the sheet, **what would** happen to space-time?

For more information, see Even Albert Einstein Had His Doubts About **Black Holes** - HISTORY

I found an answer from physics.stackexchange.com

Why **does** a **black hole have** a finite mass? - Physics Stack Exchange

**Black holes don't have infinite density** at their singularity/center. ... **if** it **has infinite**
**density**, that **would** mean it **has infinite gravity** (or **infinite** ...

For more information, see Why **does** a **black hole have** a finite mass? - Physics Stack Exchange

I found an answer from www.khanacademy.com

**Black holes** (video) | Khan Academy

**If** it **has no** mass, how **is** it affected by **gravity**? I thought that **gravity** only ..... I once
read that a **black hole has** zero volume and **infinite density**. Which, in simple ...

For more information, see **Black holes** (video) | Khan Academy

I found an answer from www.bbc.com

Stephen Hawking's Reith Lecture: Annotated transcript - BBC News

Jan 26, 2016 **...** DS: The phrase '**black hole**' **is** simple enough but it's hard to ... Once anything
slips over the edge or 'event horizon', there **is no** ... symmetric star **would** contract
to a single point of **infinite density**. ... This **is** how the effect of **gravity is** explained.
... **If** you **are** above the falls, you **can get** away **if** you paddle fast ...

For more information, see Stephen Hawking's Reith Lecture: Annotated transcript - BBC News

I found an answer from www.britannica.com

How Do **Black Holes** Really Work? | Britannica.com

Science fiction **has** often relied on the concept of **black holes** as a plot device,
painting ... In short, **black holes are** massive pits of **gravity** that bend space-time
because ... a singularity—something consisting of zero volume and **infinite**
**density**. ... **Black holes are** hard to find, but **if** you **not** only **did** find one but also
went inside it ...

For more information, see How Do **Black Holes** Really Work? | Britannica.com

I found an answer from www.quora.com

**If** a **black hole has** an **infinite density**, why **does** it **not have** an **infinite** ...

**If** a **black hole has** an **infinite density**, why **does** it **not have** an **infinite gravity**? ...
**When** mass **is** pushed in, that mass **will** create a **gravity** well around which light ...

For more information, see **If** a **black hole has** an **infinite density**, why **does** it **not have** an **infinite** ...

I found an answer from www.smithsonianmag.com

**Would** Astronauts Survive an Interstellar Trip Through a Wormhole ...

Nov 7, 2014 **...** The movie's wormhole **is** based on real physics from retired CalTech ...
mathematical model of the entire universe, including **gravity** and the particles ... of
a **black hole is** a singularity, a neutral, unmoving sphere with **infinite density**. ...
Even **if** exotic matter **was** available, traveling through it may **not** be pretty.

For more information, see **Would** Astronauts Survive an Interstellar Trip Through a Wormhole ...

I found an answer from www.nationalgeographic.com

Einstein's Evolving Universe: Beyond the Big Bang

Einstein concluded that the cosmos **has no** universal clock or common reference
.... be found at a **black hole's** center: a point of zero volume and **inﬁnite density**, ...
“**If** two **black holes** collided, **gravity** waves **would** be the only signals to come out ...

For more information, see Einstein's Evolving Universe: Beyond the Big Bang

I found an answer from en.wikipedia.org

Gravitational singularity - Wikipedia

A gravitational singularity, spacetime singularity or simply singularity **is** a location
in spacetime where the gravitational field of a celestial body **is** predicted to
become **infinite** by general relativity in a way that **does not** ... In this case the
universe **did not** collapse into a **black hole**, because currently-known calculations
and ...

For more information, see Gravitational singularity - Wikipedia

I found an answer from imagine.gsfc.nasa.gov

Ask an Astrophysicist: **Black Holes**

Mar 8, 2017 **...** **If** light **has no** mass, how **can** it **get** trapped in a **Black Hole**? ...... How **can** a **Black**
**Hole have** zero volume and **infinite density**? .... How **is** it possible for **black holes**
to emit matter even **if** their **gravity** field **is** so intense?

For more information, see Ask an Astrophysicist: **Black Holes**

I found an answer from www.scientificamerican.com

According to the big bang theory, all the matter in the universe ...

According to relativity theory, space **does not** like to remain static; for all but the ...
A **black hole is** surrounded by an event horizon, a surface inside which we
cannot see. ... **if** you squeeze matter to a high enough density, it **will** collapse into
a **black hole**, .... universe expands from **infinite density** without forming a **black**
**hole**.

For more information, see According to the big bang theory, all the matter in the universe ...