When Black Holes Collide - AMNH SciCafe

When black holes collide, the energy of the event generates intense gravitational waves. These waves were predicted by Einstein in his theories, but scientists have only recently been able to detect them experimentally. In this SciCafe, Barnard College professor and astronomer Janna Levin shares her scientific research on the first recordings of a gravitational wave from the collision of two black holes 1.3 billion years ago.
#blackholes #SciCafe #AMNH #collisions #astronomy #space #universe
This lecture took place at the Museum on December 7, 2016. To learn about upcoming SciCafe events, visit amnh.org/scicafe. To listen to the full lecture, download the podcast here: www.amnh.org/explore/news-blog...
The SciCafe series is proudly sponsored by Judy and Josh Weston.
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[@AnexoRialto]

Well done. A complex topic summarized in half an hour.

[@scotts4492]

That was incredibly articulated. Bravo!

[@velvetrest4566]

Speaks with confidence and eloquently explains subjects of this caliber to an audience. Amazing!

[@enigma6514]

It is the best explained lecture I ever seen on space and related. Bravo....! and Thank you mam.

[@Hostilenemy]

Ahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh. Deep sigh for amazing food for thought. I needed this to get through the day.

[@SPACETVnet]

Very interesting. The Hayden Planetarium is one of my favorite places on Earth.

[@thomasfleig1184]

I love listening to her talk. She's very intelligent, but explaines everthing in easy to understand manner. I also love her enthusiasm. Makes me wish I would have gotten into astronomy.

[@caralynschwartz4442]

She is a great speaker.

[@lantose]

One of the best! She is a beautiful woman and her personality is incredible!

[@ricdwe]

Very nice and informative lecture. The astronomer did a fantastic job with her presentation.

[@TalladegaTom]

Great talk! Thank you.

[@UnderAlog572]

Why memories something you can look up... Thank you. 😍

[@shantanudesai3513]

Awesome talk. One minor correction. Black hole name was coined in 1970 by Ruffini and Wheeler (not 1967)

[@roberth.5185]

My dogs can detect gravitational waves. They bark erratically and then chase the cat.

[@piotrlenarczyk5803]

If blak hole does not posess mass it wil be only a measure of mass streamed? Also why Schwarzchild radius grows with that thesis?

[@Luisitococinero]

Good cafe!

[@Jason-gt2kx]

My hypothesis that Dark Matter is not a WIMP, but maybe is a deformation of space-time by which the curvature of space-time ALONE is the cause of the gravitational effect. Gravity is the consequence of the curvature of space-time. It may be possible that the structure of space-time itself could be warped without the presence of mass. Space-time has been shown to react like a fabric by warping, twisting, and propagating independent of mass. These properties have been proven with observations of gravitational lensing, frame dragging, and now gravitational waves. Fabrics can be stretched, pressured, and/or heated to the point of deformation. Such extreme conditions were all present during inflation, so it is plausible that space-time’s elastic nature could have hit its yield point and permanently deformed. Therefore, if gravity is the consequence of the warping of space-time, and fabrics can be permanently deformed, then a deformation could create a gravitational effect independent of mass. Thus, the unidentified dark "matter" that seems to be so elusive to modern science may not be matter at all but merely warped deformities causing gravitational effects. DM could be a microscopic black hole with no mass at the center... Prediction: Spacetime's elastic property hits a yield point, so only that part of geodesic's "stretch marks" would remain after inflation stopped. These steep gravitational wells would not follow the inverse square law.

[@poetesq8623]

Wheeler who I met when he was 90 (delightful charming fellow) invented the term black holes in1950.

[@trpbluntsk4887]

He old

[@juangreen8194]

Does this gravitational waves get "red shifted" as light does?

[@qcislander]

I suspect so (unless GR is wrong)... but it might be a really long time before anyone produces observational data that's *clearly* supportive or dismissive.

[@Chrisoula17]

Joan Rivers also went to Barnard College. She majored in sociology.

[@stephenswan2396]

please reply , i have dreamt this a lot, the huge black red cloud

[@theheadshot45]

Janna Levin ^~^ yayay

[@UnderAlog572]

All informative and all but, the question is what is a "black hole sun"

[@mikeboyd4853]

Have you seen any read how's in the galiex a red druf you have putt on things that are not in there yet so much easier than trying to reach the position

[@jed92y]

Fantastic lecture. Leaves me with more questions than when I started, and that's a good thing. I need to look more into what Janna means when she says "black holes are empty space time." Like, if the matter that we all incorrectly think is there, is not actually there, what is perpetuating the gravity and space time warping. If a black holes "evaporates" off all of its matter into Hawking radiation, at some point does the black hole experience enough mass attrition to no longer be a black hole?

[@BGraves]

jed92y yes but so slow that matter will be spread so thinly and as energy that black holes will still persist

[@brianbatie6650]

Imagine stirring your tea, creating a whirlpool. When you withdraw the spoon, the whirlpool won't suddenly stop, it is only gradually slowed by friction. The friction coefficient of spacetime is not sufficient to slow the whirlpool of a BH to any appreciable degree. As for the mass attrition, Hawking showed that the BH will evaporate over roughly a googol of years, as the temperature of spacetime falls below that of the BH. At a certain point, it's gravity will be overcome by the energy contained within, and it will release the remaining energy in a final, universe-shaking pop.

[@aminkanji8501]

Miss you Janna

[@don3724]

What Black Holes?

[@TotalRookie_LV]

62 M of Sun? Not all that much. For a couple of month I'm wondering, what will happen when supermassive black holes merge? Like, say, those in the middle of the Milky way and the Andromeda; will it be detectable only by supersensitive instruments or will there be some pretty noticeable events?

[@TotalRookie_LV]

P.S. Also, from the perspective of astronomy - an idea for a slogan for a T-shirt: the future is dark.

[@scottbrady9477]

The more gravity something has the slower time go's (the more time is has), it's called gravitational time dilation. I have a theory that black hole aren't holes, as i believe that all matter that falls into it go's past the event horizon all the way to the center. I believe that people viewing a black hole see everything stop at the event horizon, because to the observer gravitational time dilation at the event horizon is infinite, so matter just appears to stop. My theory also explains what scientists recently witnessed when they saw two black holes collide, they expected with the increase of gravity the event horizon would get smaller, but saw it get bigger. AS with my theory the increase of gravity would move the point of infinite time out making the hole bigger.

[@cweefy]

fascinating . i wish I had better abilities to understand .

[@brianbatie6650]

Try thinking of spacetime as a liquid, in which you are immersed. Actions of things in the liquid produce ripples. If the action is energetic enough, the ripples are detectable over the observable body of liquid.

[@chuckruckus3648]

Janna 😍

[@stephenswan2396]

weve done this before, we are the big bang echo, i think this is the last spin tho, when dreams become realliy

[@warrenhunter4422]

My Moon Goddess 🖤🌀💥🌎💫

[@stephenswan2396]

i can feel my reality colliding, pls tell me the same im awake and sleeping

[@MAMP]

Me at 6:40 0_o.......o_O..........O_O!!!!

[@roberth.5185]

I hope one day to power my moped with gravity wave technology.

[@paulmichaelfreedman8334]

For gravity waves, check out Interstellar.

[@amixofeverything]

I thought Sol was actually classified as a yellow dwarf, but was actually white.

[@larsulrik1699]

Einstein realised that gravity is actually indistinguishable from acceleration. And then he probably also realised that earth most likely must be flat. Because how can "gravity" ever be caused by acceleration on a globe earth? It makes no sense. But he couldnt say this. So that's when he came up with "space time".

[@ucntcit]

She's explained why humans are backwards: we're always pointing outward in a universe that is inwardly-focused.

[@godzillazumagod9146]

I lived forever.

[@samamazz4395]

11:20

[@mikeboyd4853]

Wat Will happen to the plants that are going out of light matter do they get scukin the how's a read darf in a grean blue diamond mater how s

[@benquinney2]

Trajectory arc

[@bravopicasso5839]

I have pictures of binary black holes. North? AlToldMe........

[@mark-]

She got a couple of things wrong but mainly interesting for those who didnt know before

[@warrenhunter4422]

She's never wrong 🌚

[@Khannea]

Very cool You know what would be even cooler? Get Michelle Wolf and imitate this lecture, same background, same slides, more or less the same words, but with snickering, that hilarious voice and jokes interspersed. That would truly be something.

[@venkateshbabu5623]

When two super massive black holes meet they throw energy in one direction like gravitational lensing and creates light in one direction called big bang.

[@venkateshbabu5623]

Like torch.

[@venkateshbabu5623]

There are things which can travel more than speed of light .

[@arfanfani3954]

xxx

[@rudolfmuradyan9179]

Dr. Thorne, who is now retired from LIGO. Dr. Drever, who has dementia and lives in a nursing home near Edinburgh, is not able to enjoy the victory lap. Dr. Weiss, who is retired with emeritus status at M.I.T.

[@Nanahuatin]

My ancestors knew about this before the Spanish Conquest aka pillage invasion

[@thersten]

Yet somehow you still became a failure. 😂😂😂

[@Nanahuatin]

@@thersten yet you've became a meaningless troll

[@thersten]

@@Nanahuatin triggered.

[@Nanahuatin]

@@thersten I just want to know about The rooms behind your minds Do I see a vacuum there, or am I going blind?

[@thersten]

@@Nanahuatin still mad 😂😂😂😂

[@szentagostonka]

Black hole is not empty. Very dense material.

[@kinpatu]

What happens if a black hole formed from matter collides with a black hole formed from antimatter?

[@szentagostonka]

Win the heavier?

[@kinpatu]

No, they are not in conflict because there is no matter inside. If a 10 solar mass matter formed black hole combines with a 10 solar mass antimatter formed black hole, you get a 20 solar mass black hole minus the mass equivalent of energy emitted in gravitational waves. The type of matter that originally formed the holes is irrelevant.

[@szentagostonka]

If you think no matter in black hole, what causes her gravity?

[@kinpatu]

It's an interesting paradox isn't it?

[@jeronimomod156]

The headline. Sounds like a joke about liberal sex

[@MrGomez0724]

Would have been great had it not been for the abuse of the word, "Literally..."

[@cymoonrbacpro9426]

They Keep on pushing this lie.