What Stephen Hawking Really Said About Black Holes

Hank explains the science behind recent reports that physics great Stephen Hawking said "there are no black holes." There are. They're just super complicated.
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Sources:
arxiv.org/abs/1401.5761
arxiv.org/pdf/1401.5761v1.pdf
www.popularmechanics.com/scien...
www.pbs.org/newshour/updates/h...

[@musicisbrilliant]

I could watch this damn show ALL DAY. And theres enough episodes to do it!

[@skit4471]

+musicisbrilliant 2months later and im repeating your jearney trough Scis Playlists

[@Talladarr]

+musicisbrilliant I've been watching these episodes for... God I think it's been the last 4 or 5 hours?

[@someonethirsty1957]

+Mizati What a coincidence. I've been watching you for that long.

+Mizati green and watching

[@javaaugustus4469]

I've already done it

[@delusionnnnn]

Thanks - it's been very exasperating to see how badly this paper was reported on not only in the mainstream press, but even a lot of the tech/geek and pop science press who should have known better.

[@randomvideosbyarandomguy2709]

delusionnnnn r

[@harrymills2770]

They've been misinterpreting Hawking for a long time. And taking some of his nuttier comments as gospel because "genius." Half cult. Half ignorance. Half informed, which adds up to a tidy 150%.

[@computerpcguy1]

If Stephen Hawking's audio book doesn't get read out in his voice Audible is wasting everyone's time.

[@harrymills2770]

cult of personality. I'd rather hear a voice that's not encumbered by his debilitating disease.

[@swagboicomments5654]

the creator of spongebob got the same disease that hawking got

[@brianbullivant4753]

den bob Brilliant comment, I couldn't agree more. Now I'm curious to know. Thank you.

[@Neceros]

Black holes are like universal blenders.

[@sw3dishminecraft]

you! you deserve a cookie!

[@danielsepulveda2012]

or recycling plants lol

[@RinoaL]

Christoffer L is that a sneaky referance to BlenderCookie.com? i use it sometimes.

[@sw3dishminecraft]

Rinoa Super-Genius unintentional pun hehe

[@RCcrAzY1234]

hah, universal. I see what ya did there ;)

[@chefkendranguyen]

Very interesting, the media needs to get people who can read themselves so they can report things properly. They won't be it would be cool if they did.

[@anon746912]

I wouldn't be surprised if they misinterpreted it on purpose - Stephen Hawking saying "there are no black holes" creates more attention (and thus more money for media houses) than "insert complicated physics here".

[@christianmorales8978]

They only report things inaccurately to get more attention and they know perfectly fine what they are doing since they are a business just like any other and need to make money even if means spreading misinformation. They don't care as long as the common misinformed people buy into it and read it.

[@TilekMamutov]

Wow, I would love to hear more about physical information!

[@5tr41ghtGuy]

Thanks for another informative & entertaining video. Keep crankin' them out!

[@MrPivotmaster98]

first time viewer here, love the meter on the side, nice touch that more channels should adopt.

[@dragoncrystal24]

Oh man, watch this video at 0.5 speed. You will thank me

[@PiOfficial]

wow

[@svs1294]

Lmao drunk hank xDD

[@GiveMeBass93]

2x speed* lol

[@ArcticAstrophysics]

He sounds like a hippie stoner at .5 speed

[@Tyres2]

it's gonna take me twice as long but this is how i'm gonna watch SciShow from now on.:|

[@Swimmer7596]

Could you please make a video about that whole blackhole-disappears-thingie because it sounds quite interesting and I've never heard of it before :)

[@Swimmer7596]

thanks man, nice explained :)

[@Hunnah0055]

it's an honor to be alive around the same time of hawkings.Some day we just going to hear about him in the books and not live on TV or read his papers as he publishes them

[@gevu]

Amazing to think about stuff like that... He's one of the greatest minds of all time, like Einstein, Edison, Tesla, etc., and the world likely won't be able to fully appreciate him until he's gone, like all good things

[@Hunnah0055]

Daniel Jordan exactly. There will be more great ( and already are) minds. I just want to be around when they show up in my radar.

[@JoshuaHamiltonFilm]

Hunnah0055 Oh my gosh. A KZbin comment thread that is nice and full of agreement. The world is getting better isn't it? :D

[@Hunnah0055]

Joshua Hamilton LOL I know right. I usually get death threats because I'm so open with my views

[@ShayeChild]

Hunnah0055 I think it's simply the audience that sci show attracts. Curious people. Here we get late breaking scientific stories and complex ideas presented in palatable bite sized and easy to digest portions. It's a very welcoming environment. And that's why I love this series as well as Crash Course.

[@anagram5830]

Yay! I've been wondering about this ever sense i first herd it... Thank you, all of you, keep it up!

[@sonicxrandomness]

I like the part where Hawking said if you go into a black hole you will turn into spaghetti... I'm getting hungry now. O.O

[@prankfiles]

Going out for pasta and meatballs. kzbin.info/www/bejne/q3WWhatnj9OHeMk

[@drewnut]

proof of the FSM

[@chaz706]

Would you eat yourself though?

[@VividlyVindicated]

Charles Hammond Jr Yes, in more ways than one. :3

[@brianbullivant4753]

Personally I would rather be Lasagna-fied. Now I'm hungry as well. Thanks a lot!

[@ReiperX]

Reminds me of people quote mining Darwin about the eye.

[@MiriamLylac]

I'm so glad you made this video, because the quote was so obviously unclear and out of context. Thank you for keeping it brief and informative!

[@dave5194]

thanks for clearing things up hank!

[@7249xxl]

You guys provide information. knowledge and other awsome stuff. Making work life a whole lotta fun knowing these things. Am also glad i found you guys out like a week ago >.< Gives me plenty of viewing material..

[@Sohltaker]

I really enjoy American football. I played it in college. Which is where I majored in physics. According to some of the comments I read, I cannot be a "good nerd" because I was a jock. I collected comic books, I can quote Star Trek episodes from all 5 shows. I was a physics major AND a drama geek. I also lettered in football, basketball, and baseball. What I'm saying is: just because it's now chic to be a nerd, doesn't give anyone the right to be a geek gatekeeper. There's plenty of room for all of us.

[@Hellheart]

Christopher Turner Dude, I feel that. I'm a doctor of Biological Chemistry and I played football and rugby in college. I have taken Muay Thai and Brazilian Jujitsu for several years off and on. And, I'm also an avid gamer. Video games and table top role playing games. I still collect comic books, Magic Cards and Pokemon Cards. My oldest daughter is into Pokemon, also. My wife is honestly straight up gorgeous. I love when we're in public and she gets hit on if I'm not around. Lol. So, I know exactly where your coming from with this comment.

[@karmalakas]

Why did I always think of this and never told anyone?

[@Amanda_R]

Hey!!! Everything about this was great! 1. Clearing up misconceptions: thumbs up. 2. Free book to read: double thumbs up. (p.s. just wondering....3 in a row in 24 hours? Do you sleep?)

[@InorganicVegan]

The last one was a subbable sneak peak that they made public. I saw it first. :P

[@Ravenclaw1991]

Who needs a valentine when you have science?

[@tuseroni]

"late nights all alone with a test tube oh oh oh ohhh"

[@ethansmith8564]

I saw that on the internet once. It didn't end well for the test tube and even worse for the girls vagina.

[@theeutecticpoint]

Thanks for the read list!

[@eldulcineo29]

Wow, what a difference! I've read an article on this a few days ago. Thanks for clearing this up for us. It makes much more sense now.

[@ProfesserNipplehimer]

Are you ready for some PHYSICCCSS ?

[@GroovyAwesomeness]

I just watched Event Horizon last night. Awesome movie.

[@LilMissCms]

Brilliant episode guys, thank you =)

[@PhynixPc]

Wait...the media getting something wrong about science! Shocking! Lol thanks for the great episode SciShow. Setting the record strait for us.

[@akmalsy159]

Scishow, please cover the lifespan of Black Holes from its creation to death? Can/ How do black holes disappear from existence?

[@1098234567]

They radiate out all of their energy....Like a fire burning through all of the material that it burns in order to keep it going.

[@josephplogger8588]

The stretching of space-time creates virtual particles, through quantum flux, in pairs near the event horizon. One of the virtual particles falls into the black hole, the other is released as an actual particle. This causes the entropy to decrease, which causes the black hole to heat up and shrink. The hotter the black hole, the smaller the event horizon, the lower the mass, the closer the event horizon is to the center of gravity, the stronger the effects of gravity, the faster they radiate. Black holes radiate as black-bodies. If you want to learn more about black holes, Kip Thorne wrote a great book called Black Holes and Time Warps. It's great, especially for those who do not want to go through the equations.

[@kylehoell]

i can understand this but not football, i hate football.

[@shell62672]

To Kyle, I really understand football well. So well that I shock guys with my knowledge, cuz I'm a girl. . I kinda understand what he is saying. But I really need more information, to totally understand all of this.

[@clancym1]

you don't REALLY understand it though. you understand a layman's version of it, but to really understand it you'd have to be a physicist who knew the equations and understood them. don't be like that.

[@10trent33]

I bet you hate physical activity in general.

[@alexinator10]

what episode is he talking about where people become butthurt over football????

[@TheRealSnapfoo]

Alexi Maybe concussions and the superbowl? :)

[@qasimqureshi1230]

Thanks for the explanation. That was easy to follow for a novice such as myself.

[@danielemessina1979]

this stuff is complicated, and speaking this fast makes it clearer, good job

[@rogermckay8447]

I like football AND physics.

[@threat_dynamics3272]

+Roger McKay: Okay, that makes two of us. Any more out there :-) ?

[@TedMan55]

+Threat_Dynamics ayyyy right here

[@peetuhgriffin]

+satoma satomis Screw you. That's one quite ignorant comment, thus revealing your identity as an enraged 12 year old with zero social contact. Also, that makes four of us, +Roger McKay

[@taken_over3416]

I will join the club

[@jtxdesertrat]

+Roger McKay six of us

[@JumpyPlum9613]

Well, that must suck for Steven Hawking. He said something completely different than what everyone else thought because not the whole quote was told in all the news articles and whatnot.

[@benthor13]

is this a draft??

[@orangereplyer]

I see what you did there.

[@FernieCanto]

NEWSFLASH: KZbin tells people to "suck for Steven Hawking"! Is Google promoting sexual promiscuity?

[@shafiqifs]

Since the very space-time concept has been shown as baseless in the published paper "Experimental & Theoretical Evidences of Fallacy of Space-time Concept and Actual State of Existence of the Physical Universe" which is available at www.indjst.org/index.php/indjst/issue/view/2885 so there is absolutely no possibility of existence of Black Holes or event horizons.

[@FernieCanto]

Shafiq Khan I searched for that article on Google and found, with amusement, that even though you're promoting it as a sort of unquestionable and definite answer to everything, you wrote that article yourself. Not only that, but every other reference to that article that I found on Google was, hilariously, also made by yourself. Was your article even peer reviewed? I mean, it seems to me like you're obsessed with proving something that you think is true, yet the only thing you're able to do is spam that one article to death, as if you're blinded by passion. Yet, for all that spamming, I cannot find links to anyone either corroborating or critiquing your paper. Could that be an indication that there is absolutely nothing in it that is worth talking about, that it is sheer nonsense?

[@liveoptimistic]

This video has finally explained to me meaning of the TL;DR. Thank you.

[@LauraPictures]

I read A Brief History Of Time around 1½, maybe 2 years ago and that kicked of some kind of chain reaction, since I kind of started hating physics after having some really bad teachers and thus me not really understanding it anymore. But when I started reading it, I didn't understand some things here and there or wanted to dive deeper and so I went to KZbin and found SciShow and SciShow Space and from that CrashCourse and Vlogbrothers of course and so many more and ever since I love all those channels and have learned so much Thanks 💙

[@1KevinsFamousChili1]

TLDR on a 3 page paper? The lay man journalist mind ladies and gentlemen

[@Kram1032]

I'm pretty sure the truth is TC;DR (C = complicated) It's not really THAT complex a paper if you know at least a bit about the background, but there is heck of a lot of not exactly every-day-life terms in it which will cause out-of-context-quotes of the few lines that are understandable, if misleading, to a layperson.

[@DragoniteSpam]

Man, the comments down here are more toxic than usual . . . guys, there's nothing wrong with liking American football, or association football, or any other sport, but there's also nothing wrong with the people who don't particularly care for them. Enough is enough. This is a science video, you're allowed to be more mature than the people who comment on politics videos.

[@GeorgePencilArt]

I enjoyed this film which was on a recommended screen on my YT. Subbed! I was glad to hear black holes gradually explode to release their energy. Saw a brief film on black holes recently, and didn't quite get why a star would collapse and infinitely become more dense (like myself? lol) and never do anything else but just swallow up everything. Nice coverage :)

[@funnyduds]

Thank you for educating people

[@jiberish001]

So main stream media quote mined like 1/5 of a sentence? Why am I not surprised at all? =/

[@1098234567]

"Main stream media quoted a sentence, not surprised at all." Bam

[@williamhughes7091]

Very informative. HUGHES

[@IcosahedronLord]

Glad you cleared this up; I'll go read Hawkin's article tomorrow to properly shut traps up when someone aproaches this subject. Keep it up!

[@MakeMeThinkAgain]

Thank you. I read what little I could find about this and couldn't see anything new and wondered what the big deal was.

[@daxdigitalus]

I didn't see the last show, but... I hate football too! I just wanted to jump on that bandwagon before it gets too far away.

[@harrymills2770]

I love American football. But I think it's a dying sport.

[@BertGrink]

#BlackHolesMatter ;)

[@MythCraft00]

Pun intended :P

[@ghoulenthusiast5731]

#NoHolesMatter

[@alexgard1773]

Gert Brink Nielsen #AllHolesMatter

[@alexgard1773]

ThereIsNoSpoon DID YOU JUST ASSUME MY MASS

[@radu7907]

you discovered that just now??? :p

[@TheLisaAlexandra]

Love it, more of this

[@Frictionfriction]

Hank Green and John Green are my favorite people who exist.

[@Hobypyrocom]

Hank can you pls research and revisit and fully explain the atomic model using the new research and findings about quantum physics, just connect the dots for us, explain whats electron, why and what is his negative charge, why the electron doesnt fall to the core, why and how do you excite and electron to jump to higher or lower orbits, what is proton and what and why it is its positive charge, how the quantum physics explain magnetism, what happens if you for example collide proton with an electron, how the electricity flows thru conductor and semiconductor explained using quantum physics... i cant find any full explanation anywhere about the full atomic model and how it connects with the finding of the quantum physics. i think that viewers will find it useful and interesting. if anyone knows about such resource pls share it with me.

[@muveemania]

I think its best that you look into quantum electro dynamics.

[@dragooner4]

The things you are asking is basic reason why quantum mechanics was invented. There are many university that release lectures that go on in plenty detail about everything you want to know. This stuff isn't easy to understand, sci show won't be able to give a quick summary. If you really want to understand the material, then you have to "connect the dots".

[@IceMetalPunk]

Thank you for covering this! The media has been very stupid in its coverage about it. Glad there's some sensible people in the media (I consider you the media, Hank) :) Hey, you think if I start saying "T-Hank you, Green" on these videos, it'll be a thing? Someone should adopt it with me. I would very much T-Hank anyone for adopting it.

[@sebyiuga2184]

IT IS DONE

[@IceMetalPunk]

Seby iuga Really? :D Well, T-Hank you, Seby :)

[@sebyiuga2184]

this was too good of an opportunity to pass up

[@IABITVpresents]

Tom Hanks you

[@HarshColby]

You talk so freaking fast! *Love it*

[@mustafa1912]

This is the simplest and best explanation on this subject.

[@shamanahaboolist]

Hawking is right. Clearly singularities are drivers of cyclic processes by which entropy is gained and a gradient restored with new elements being produced.

[@chrisiscool06]

Whaaaa?

[@LordWhirlin]

I like turtles.

[@chrisiscool06]

ooooooh that's what he meant. Thanks for explainig!

[@shamanahaboolist]

GhostsFootball I think black holes are more likely to produce the forces critical to creation of elements than supernova. It's like a big recycling process. Information isn't lost in a black hole it is transformed... I think anyway. Obviously it is just hypothesis... but I totally support Hawking on his latest hypothesis. I've always thought that was more likely to be what was going on rather than black holes some how violating our most common observation of conservation of energy / information.

[@chrisiscool06]

Either your very smart or you are trolling. Congrats either way.

[@omarsantana3680]

Hank, you have excellent lungs.

[@ratjockey]

nice episode

[@MrNiceHk]

Great Video

[@samuraimaster99]

Well.. I kinda got distracted by how that thing on the left covered up things that were already done and was slowly moving the whole video

[@emmkayel]

I was watching that the whole video instead of Hank. I think they should go back to the scratchy line thing.

[@samuraimaster99]

Emma Kate Laubscher honestly, for me, it doesnt matter either way, but u gotta admit that that thing was cool enough to distract people lol

[@AndreasFilms]

I actually saw this on different news websites but i decided not to read anything and wait for you to explain it to me... thanks! :)

[@milliecoleman6998]

Great video! Can you make one about all the sinkholes that are opening?

[@SuperNumber420]

what sinkholes? I ask purely out of curiosity, I won't be starting any argument here.

[@milliecoleman6998]

SuperNumber420 well there just seems to be a lot of sinkholes on the news recently so I was just wondering why there were so many!

[@deskjockie49]

Millie Coleman there's a big one in Bayou Corne in southern Louisiana.

[@milliecoleman6998]

iamihop aye cool!

[@milliecoleman6998]

iamihop Thanks this was very interesting and the reasons make a lot of sense! Thank you! :-)

[@charlesrenshaw6316]

I liked.Any info.rite or wrong is cool!

[@oathblade]

Could you explain sometime why information must be maintained? Ive heard that phrase before but it never is explained. Im really curious about it.

[@Prometheus42]

the law of conservation of energy

[@oathblade]

Why does that mean energy and matter must retain some sort of spiritual record of what it was? It sounds more like a philosophy/relligion.

[@Prometheus42]

Energy cannot be created or destroyed, it can only be converted, for example: When kicking a football that is sitting on the ground, energy is transferred from the kicker’s body to the ball, setting it in motion. The energy that was once inside the kicker's foot was transferred to the ball, making it move. No energy is lost.

[@oathblade]

Right. But how does that energy retain the information that it was attached to a food, made by sugars and the like and why would it retain that data?

[@Prometheus42]

it doesn't retain that data, the word "information" is given a different meaning in this case, unfortunately, i don't know enough about physics to explain it :p

[@WobblesandBean]

Is it just me, or does Audible support, like, half of the youtube channels in the history of ever?

[@jeanborrero]

Interesting stuff

[@ToniT800]

Ok, you finaly got me. I really gone to audible and downloaded some auidiobooks:)

[@MadCowGamers]

I had an idea a while back, What if the "information" that is lost is actually put into universe it self. Now you are probably wondering what the hell am i talking about... we are in the universe! well yes and no the universe holds us and the information is put into the universe skin it self so the information is being put into the universes which makes the universe grow which means the Information which is *lost* becomes dark energy. The more mater which enters a black hole the more space is built.

[@TerenceClark]

Thanks for adding some serious science fact-checking to the mess that is the public understanding of physics.

[@maegnas87]

Hank, gotta say, you are one of my favourite popular scientists. You rank among Dr. Brian Cox in my eyes. I don't intend to rank you among him for you academic achievements, no offence, but for your ability or relate modern science to the masses, you are right there with him. Maybe you could do a little talk about the idea of singularities not being true singularities. Maybe even just refer to Henry Reich in minute physics to describe the possible idea of bounce. I love your channel.

[@matthewhumphries6833]

Always have time for physics!! Perhaps you could do another video on the LHC and explain the upgraded of 3 times it's power to 140000000000 (trillion) volts

[@SHIFTKICK]

I like football :( I guess I am one of the few nerdy football players out there

[@r4fken]

Nah dude im with you. Its awesome

[@r4fken]

Just because someone partakes in sport doesnt mean theyre a brainless mong...

[@iluan_]

***** What if I told you that being athletic does not imply you can't be smart.

[@SHIFTKICK]

WHAT? IMPOSSIBLE!

[@r4fken]

iluan Hernandez Actually its a well known fact that to be good at sports you need to have a below average IQ and a mutation that actually turns your brain into a giant muscle that flexes every time you see a women in short shorts...

[@walkermenkus104]

T-Hank you, Green :D

[@lukasvjohansson]

I love this channel..!

[@keithdow6]

Thanks for the explanation. Black holes and general relativity are well established in physics because of many observations. It is amusing to see comments from people who know nothing though.

[@voveve]

Just a little more exciting than football! At lest for me! :)

[@enlightenment2445]

If that's the case then the initial statement would be true, or one can say that the definition of a black hole has changed because the initial definition is now false.

[@snoguera01]

Ben Joseph In my perspective, when Mr. Hawk (it sounds cooler) said they don't exist, he was simply refering to the defenition we all know, a place where things simply dissaper like light. So what we know as "Black Holes" still exist, it just work differently than we thougth.

[@enlightenment2445]

Sal I agree because that is what I am stating. If what we knew as a black hole doesn't perform the actions of what we thought a black hole did then they are no longer black holes (they are space holes are whatever other term that can be created). But as humans we are always entitled to simply change the definition. It's the same difference for that matter. 

[@ThePokeman92]

Thank you for covering this! I thought it was weird when I heard about it, so I did look at the full quote, and I'm glad you are spreading what he really meant by it instead of just joining the media "Click on this news article!" frenzy.

[@t1995roger10]

It would be great to see you do a video on how motorsports like f1 technology that trickled down to road cars

[@thoruszwolf4153]

Well, the thing about a Black Hole, it's main distinguishing feature, is it's black. And the thing about space, the colour of space, your basic space colour, is it's black. ...So how'ya sposta see'em xD

[@TheOTNightCow]

You can predict were stationary black holes are using the general location of our galaxy or other galaxies with a black hole in the center.

[@thoruszwolf4153]

TheOTNightCow I know :) ... I see you aren't a Red Dwarf fan -'J

[@nihilistteddy3]

Event Horizon... good movie lol

[@CNC-Time-Lapse]

... that movie gave me nightmares. :)

[@djgruby]

The best host!

[@AnimalSites]

Hank SciShow, oooooo. Leave the singing to the songbirds. Ha ha!! Thanks for another great show.

[@TheRedKnight101]

I will not make a comment about which number my comment is

[@Glendragon]

you just did kind of

[@ezecoo]

The Void Rather, he made a comment about how he would not do so, so no, he did not make a comment about his comment's number. He did exactly as he had stated.

[@Snufkin224]

With the new comment system it doesn't really matter.

[@phyrath5]

If you're the first person to comment or due to Google errors from you current perspective are the first person the proper way to do it is this: [insert real comment here] P.S. All first comments *DENIED*! The comment you made is a comment about the number that you comment is, the comment composition method I have provided allows you to remove the annoyingness of FIRST! comments without the logic fail of your comment.

[@audioholic850]

loser

[@magnitization]

Before watching this video: "nothing because he can't speak..."

[@Lorimunae]

Screewwww this! I was about to listen to some awesome music until I read the title of this video! Then I keep finding MORE interesting videos by SciShow! You're a big, but good, distraction from my music! lol

[@bishopofapples]

I love when people include sources in the dooblydoo. All most as much as I love channels that call it a dooblydoo.

[@Roenazarrek]

Whoa whoa whoa, never heard this "conservation of information" thing. Sci show can you elaborate because I must be misunderstanding exactly what you mean by information, as as I currently understand it the pittance of information held in this comment didn't exist before I typed it out.

[@Roenazarrek]

But I don't really see how that makes the scientific definition of information any different than the definition of the conservation of matter/energy?

[@Vulcapyro]

***** Mainly because when you talk about conservation of mass you're talking about a quantity of mass. Physical information is essentially the collection of all properties of some physical system. Mass may be one property of such a system. Structure of the constituent molecules of an object might be another.

[@quadren4]

The conservation of information is similar to the law of conservation of mass/energy; Matter/energy can't just disappear/be deleted, it's always present in some state or form. If the information of said matter/energy is deleted at some point in time, that would cause it to be non-existent in all time frames. I am not an expert on the subject, so there might be a few errors with my explanation (and it is by no means an in depth perspective). I highly suggest that you take matters into your own hands and research it yourself. The chances of Sci-Show looking at your comment, then providing an explanation, are somewhat low (it could happen, but there is a possibility that it won't); So instead of waiting for information to be handed to you, take it upon yourself to look for it.

[@pierrecurie]

What's really at stake is "unitarity of quantum mechanics".

[@Pooua]

Maybe this will help (confuse you): www.pbs.org/wgbh/nova/blogs/physics/2013/12/do-black-holes-destroy-information/

[@swissboy362]

can someone explain this to me? if the black hole disperses since it is so dense wouldn't that cause an explosion even bigger than a supernova

[@Vulcapyro]

Maybe if it happened all at once. But it doesn't.

[@toshley6192]

It will take billions of years for a black hole to release all of it's energy as radiation, think of it as a slow leak. If something caused it to disperse all at once, then yes that would be an explosion.

[@pierrecurie]

The final moment of evaporation would indeed be violent. How violent depends on when quantum gravity effects set in, and what they describe.

[@donniehw]

pierrecurie does density really have that much of an effect (affect?) on how big/small the explosion is? if i have a 4"x4"x4" cube with a mass of 100g and an 8"x8"x8" cube with a mass of 100g, if the same amount of energy was sused to 'explode' both cubes, would the explosions be drastically different?

[@donniehw]

***** this is assuming theyre made of the sasme materials *i believe thats possible... and i believe i meant density where i said mass, sorry.

[@JamesGlisson]

Thank you, Hank, for getting this out there. This headline caused me much grief last week... Reporters that don't read the news they're reporting on. Shameful.

[@StevenUj]

I love football, and physics. Too many people put too much energy into negativity.

[@Gigaheart]

Pfft. We're nerds of course we don't like sports.

[@sion8]

Oh yeah what about Chess or Quidditch?!

[@Gigaheart]

sion8 I don't consider chess a sport and Quidditch is unfortunately fake. =(

[@sion8]

Scheefinator HAHAHAHAHAHA

[@Gigaheart]

sion8 I find it so saddening..

[@sion8]

Scheefinator Well one can dream, right?

[@rattersnatters]

Tell this to Michelle Bachman

[@moongoddess1961]

well, thanks for clearing up that misunderstanding ! :)

[@PineSG]

Thank friggin' heck for your show... lets hope mega-media get a clue (well we can hope). I would subcribe... but I did that months ago.. subble? been there done that.. so ermmmm Happy Valentines! now about "time" we need input!!!

[@kght222]

sounds like a black bag to me.

[@miket558]

american hand egg*

[@zedek_]

I know you're saying this as a joke, but it's bizarre that so many people say it seriously, and don't understand why Rugby Football, Association Football, and American Football are all rightfully called football.

[@miket558]

Zedek rugby football?

[@zedek_]

***** Yes... Rugby's full name... Edit: I assumed you were familiar with "Rugby" and just didn't know its full name. I realize now that you might have been asking what the sport actually is. So just in case; it's similar to American Football, but without pads and a lot more enjoyable to watch imo. It has an oval ball (shaped like an egg), and you just try to get the ball into the end zone. Unlike American Football, the action is continuous (like Association Football/Soccer).

[@miket558]

Zedek are you american or something i have never heard it benn called rugby football

[@zedek_]

***** Americans simply refer to it by the nickname Rugby, like everyone does. The point is that its full official name is Rugby Football I guess you were saying the "hand egg" thing seriously then. Well it's stupid for two reasons: 1. It's still a ball. It doesn't need to be a sphere to be a ball, it can also be oval or ovoid. So calling it a ball is completely legitimate. 2. The term "football" has nothing to do with kicking the ball, or using your feet to manipulate the ball. In the country of origin (England), the term denoted a game that was played *on foot* with a ball, as opposed to the aristocracy which would often be on *horseback*. This is why Rugby's full name is Rugby Football, and this is why Gridiron or American Football is a perfectly legitimate name. This is also why saying "hand egg" in a serious way is... ignorant... to say the least...

[@darthbane8684]

I love Hank Green's dry humor. :)

[@Thescarecrowjoe]

Dear SciShow, I am a High school English teacher and I also love science (particularly physics and astronomy). I also enjoy football and other sports immensely. Many of my good teacher friends are lovers of learning and athletics. WE EXIST! We just don't feel the need to blow up the comment section about sports when watching a scishow or crash course video. Dare I say we might even be the majority of your viewers. Don't let the persistence of 1000 or so anti sports comments affect your perception of the 157,000 others that watched this video and chose not to comment....athletic nerds are more prevalent in Nerdfighteria than you might think. Sincerely, An English teacher and football coach nerd jock person

[@UPlayNetwork]

How can gravity prevent anything, including light, from escaping, black holes are either gateways to other dimensions or time travel makes more sense since they can't escape if not then they must under certain conditions let go of objects,

[@lollertoaster]

Yes, they are... *back up slowly*

[@ThangTran-jv7mm]

Gravity can effect energy and light has energy.

[@biteksintek2527]

Said somebody that can't even organize his thoughts in the illiterate attempt of a sentence he had...

[@pykapuka]

How can a box prevent anything, including light, from escaping, boxes are either gateways to other dimensions or time travel makes more sense since they can't escape because they went into another dimension or time or place

[@cecasander]

Black holes are actually giant balls of licorice. The reason why matter and energy is drawn to them is because they are so delicious that everything in the universe wants a taste.

[@ChrisMeccaTV]

Talk more about drugs. drugs are cool.

[@Inckman452]

you must be 10 y/o that want to look bad ass but you just look like a loser, drugs are bad for EVERYONE in the world, literally, everyone.

[@Virite]

AdolphX But, medicines!

[@JackandThePosse]

AdolphX I bet you're fun at parties.

[@michaellewis1671]

AdolphX yep, drugs are bad, especially the medication your grandparents take without which they'd have died of a heart attack years ago.

[@photondance]

AdolphX Drug ABUSE is bad. Drugs, in general can actually be quite beneficial, when they are used responsibly.

[@alfstolenable]

Knew it but nice to hear it again

[@aquamus]

Normal youtube ad before the video and an Audible promo at the end... What is the point of subbable again? I thought it was to get rid of advertising?

[@MrToxicRaps]

A chance is all I need, check me out I rap!