Stephen Hawking's Universe EP5: Black Holes & Beyond (5/ 5)

Are black holes real? Ultraluminous quasars and supermassive black holes, wormholes, and singularities.

Category:

Howto & Style

Tags:

• Stephen
• Hawking
• Universe
• Black
• Holes
• Singularities
• Quasars

[mattcroy1]

Hawking said that he believes particles can escape black holes if they are traveling faster than the speed of light... according to general relativity, isn't it impossible for ANYTHING to travel faster than the speed of light?

...or is it that the laws of physics really do break down at black holes?

[Gravitationalist]

The laws of physics break down at the singularity but not at the event horizon.

I don't think that's what Hawking said. A long time ago he said information was lost when it entered a black hole. Suskind said he was nuts and set out to prove him wrong. It took him like 10 years but he eventually proved Hawking wrong.

Hawking came back and proved both himself and Suskind wrong. Hawking lost a famous bet over this.

[Gravitationalist]

(cont)

Information is NOT lost in a black hole. It radiates away. It's caused by quantum fluctuations(virtual particles) at the edge of the event horizon. One particle gets trapped in the black hole the partner particle escapes because it's outside of the event horizon.

This is now referred to as Hawking's Radiation.

Eventually all black holes will release everything back into the universe and nothing will be lost.

I might have some details wrong but that's the jist of it.

[Maej12345]

sorry if this is stupid... is it true that. the center of the galaxys have a black hole???

[Gravitationalist]

yes they do

[aarozona]

Okay, here's my dumb question that was probably answered in the show, but unlike quasars I'm not that bright. Are black holes infinitely small "holes" with a large magnetic field that make them appear large or are they giant black spherical stars? Do I even know what the hell I'm asking? :^)

[Gravitationalist]

They are like a black spherical stars. In the center is the infinitely small region known as a gravitational singularity.

I have trouble myself understanding singularities but I'm working on it.

[keyan99]

stephan hawkingg is so awesome.

[rugssean]

Hopefully we wont find any maneaters, who are searching for new sources of food

[castillopatino90]

@mattcroy1 There is a big dispute between general relativists and quantum physicists. The one theory describes the very small objects in our inverse such as strings & the string theory. The other, General relativity or even the Newton laws, describe the very large object such as super massive stars, supernova & black holes. In string theory. These two laws are like water & oil to each other. They simply do not mix in a cohesive way in a purely mathematical manner.

[xmollyx04]

@mattcroy1 4 years after this comment was posted and now we believe that neutrinos can travel faster than the speed of light. How times change. ;)

[remarkablevisions]

What happens if something enters a black hole? Black holes can bent light so all these theories are jus an opinion. At some point technology will be advanced enough where we'll be able to test these black holes with objects. Sadly I dought any of us will be alive for that moment. Fasinating show !

[BKsMassive]

@mattcroy1

speed, time, gravity and other things are all linked.

if you are traveling at 99% the speed of light time will low down for you and it is believe if you go faster than the speed of light ( which is impossible ) time will stop

[sssorry]

@aarozona Imagine you and three other people are holding a stretched out blanket; this represents the fabric of space/time. If you set a basketball on the blanket, it makes an imprint on it, like how our sun does in space. If you set a baseball on the blanket, it may roll around until it's caught in the basketball imprint on the blanket, like how our Earth orbits the sun. A black hole is so dense, it literally falls through the blanket, stretching the blanket infinetly.

[akirafactor]

@Unit88888888 Communist sympathizer

[42399]

It doesn't take a black hole to make things travel faster than light. In quantum mechanics, electrons, for example, are thought to sometimes a) be in two or more places at once and b) teleport with no regard to the universal speed limit.

As for Hawking Radiation, Stephen himself stated that he didn't think that the rediation had anything to do with the material. This means that the information IS indeed lost in a black hole.

[tehmattbookpro]

@Gravitationalist I do too. It's one of those quantum mechanics bits that also influence the fabric of space-time in Relativity...If only String Theory wasn't a theory; we wouldn't need to be super genius to comprehend it.

[tehmattbookpro]

@Gravitationalist I do too. It's one of those quantum mechanics bits that also influence the fabric of space-time in Relativity...If only String Theory wasn't a theory.