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What Was The First Black Hole?

49m 50s7,115 単語1,243 segmentsEnglish

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[Music]

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at first it is barely noticeable among

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the millions of points of light that

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crowd the sky

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this area of space is far from dark

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illuminated as it is by the light of a

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million stars crowding a hundred million

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times more densely than they do around

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the earth

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a central cluster of suns wheel around

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at an incredible pace spiraling towards

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a singular static point of light the

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center of their and every other star's

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orbit

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and it is here where the oddness of this

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central body begins to reveal itself

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instead of a smooth circle of light in

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the crosshairs the object appears as a

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vast glowing ring cross-cut just below

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the equator filled at its center by a

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black deeper even than the surrounding

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nothingness

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and it is now you realize this is the

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black hole

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but it is not just any black hole

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this is the supermassive black hole at

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the center of our galaxy

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sagittarius a star up to this point you

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have been propelled towards this curious

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body under your own power but there now

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begins a subtle tug towards it

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you find yourself in an orbit around its

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middle along with a glowing band of

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accreting material which is lensed into

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a halo by intense gravity within the

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accretion disk you're pounded and

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pummeled by fast moving gas dust and

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debris and intense frictional heating

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causes the entire disc to radiate at

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high energy blasting your body with

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x-rays and gamma rays your dna is

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damaged beyond repair

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but soon

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that won't matter

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it is at this point

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reality starts to strain

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from the perspective of a distant

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observer the closer you approach to the

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inner edge of the disc the slower you

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seem to fall but as far as you're

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concerned time is passing normally

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now even if you could escape everyone

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you know and their distant descendants

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are already dead

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[Music]

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and it isn't just time that warps

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assuming you approach the black holes

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gaping more feet first then your lower

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body will be experiencing a stronger

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gravitational pull than your head your

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entire body begins to distort although

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the effect isn't as severe as it could

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be a supermassive black hole like

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sagittarius a-star only has a moderate

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gravitational gradient compared to their

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smaller stellar counterparts

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this continues until after an observer's

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eternity your feet hips and finally head

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cross the event horizon

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[Music]

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passing this point is the end of your

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time in the wider universe

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beyond the event horizon the gravity is

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too strong to let light or any signal

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you may survive to send escape

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[Music]

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you

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are shut off

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forever

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inside everything is turned on its head

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time and space trade places and beyond

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the event horizon it is time itself that

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pulls you down towards the center no

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force in the universe can stop this just

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as nothing can stop the flow of time

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itself what you experience inside no one

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can say and certainly not you even if

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impossibly you survived irradiation

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spaghettification and the aging of the

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universe then your voice would be

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forever silenced by gravity itself

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all that is left is the slight mass

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increase of the leviathan that consumed

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you a mass increase that will only help

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your captor pull in more victims

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such is the fate of anyone or anything

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unlucky enough to fall into the mouth of

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a black hole

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first mooted in 1783 the

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incomprehensible horror of these

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ultimate galactic predators has captured

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the imagination of scientists and pushed

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the boundaries of science for decades

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indeed the supermassive variety are

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thought to reside at the center of every

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galaxy and may well be the agents of

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their creation

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while black holes can bring about

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ultimate destruction their supermassive

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counterparts can also feed and fuel the

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very stuff of stars planets

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and life

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but many of these supermassive black

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holes also leave us

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with a mystery

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just how did they get so big in the

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first place

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if they are the seeds of galaxies then

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what were their seeds

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and finally when and indeed what

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were the first

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black holes

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5:11

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rain clutters harshly on the tin roof of

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the rudimentary shelter

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it is channeled down and collects into

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the growing gutter of water that winds

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its way through the muddy trench and

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past the sodden boots of the young

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soldiers who huddle for warmth beneath

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the darkening december sky

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the gunfire and shelling has mercifully

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stopped for now and the senior

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lieutenant ducks inside the little

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refuge to turn his attention to the pile

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of dispatches on the desk

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it is 1915 on the eastern front of world

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war one and the lieutenant

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is karl

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svartshield

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smartshield is an accomplished theorist

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and mathematician and the director of

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the astronomical observatory in potsdam

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even so the relentless pressures of the

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great war see him sign up for the war

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effort and squat in his great coat

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alongside the harrowed soldiers of the

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german army but tonight his attention is

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caught by a familiar handwriting on the

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wrappings of a bulky envelope instantly

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he recognizes it as the hand of his

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friend and colleague albert einstein

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entitled the field equations of

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gravitation the paper within lays out

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the mathematical basis for what will

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become known as the general theory of

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relativity and all of our modern

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understanding of gravity on cosmic

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scales

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incomprehensible to all but the most

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involved theorists it describes an

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elegant formulae how mata causes

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space-time to curve and how space-time

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tells mata how to move

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svartshield holds the paper in trembling

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hands and that evening risks a dim and

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flickering electric light to read and

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study einstein's work with delight the

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circular reasoning of the scholars

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equations may be mathematically elegant

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but this also makes them notoriously

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