What Was The First Black Hole?
全トランスクリプト
[Music]
at first it is barely noticeable among
the millions of points of light that
crowd the sky
this area of space is far from dark
illuminated as it is by the light of a
million stars crowding a hundred million
times more densely than they do around
the earth
a central cluster of suns wheel around
at an incredible pace spiraling towards
a singular static point of light the
center of their and every other star's
orbit
and it is here where the oddness of this
central body begins to reveal itself
instead of a smooth circle of light in
the crosshairs the object appears as a
vast glowing ring cross-cut just below
the equator filled at its center by a
black deeper even than the surrounding
nothingness
and it is now you realize this is the
black hole
but it is not just any black hole
this is the supermassive black hole at
the center of our galaxy
sagittarius a star up to this point you
have been propelled towards this curious
body under your own power but there now
begins a subtle tug towards it
you find yourself in an orbit around its
middle along with a glowing band of
accreting material which is lensed into
a halo by intense gravity within the
accretion disk you're pounded and
pummeled by fast moving gas dust and
debris and intense frictional heating
causes the entire disc to radiate at
high energy blasting your body with
x-rays and gamma rays your dna is
damaged beyond repair
but soon
that won't matter
it is at this point
reality starts to strain
from the perspective of a distant
observer the closer you approach to the
inner edge of the disc the slower you
seem to fall but as far as you're
concerned time is passing normally
now even if you could escape everyone
you know and their distant descendants
are already dead
[Music]
and it isn't just time that warps
assuming you approach the black holes
gaping more feet first then your lower
body will be experiencing a stronger
gravitational pull than your head your
entire body begins to distort although
the effect isn't as severe as it could
be a supermassive black hole like
sagittarius a-star only has a moderate
gravitational gradient compared to their
smaller stellar counterparts
this continues until after an observer's
eternity your feet hips and finally head
cross the event horizon
[Music]
passing this point is the end of your
time in the wider universe
beyond the event horizon the gravity is
too strong to let light or any signal
you may survive to send escape
[Music]
you
are shut off
forever
inside everything is turned on its head
time and space trade places and beyond
the event horizon it is time itself that
pulls you down towards the center no
force in the universe can stop this just
as nothing can stop the flow of time
itself what you experience inside no one
can say and certainly not you even if
impossibly you survived irradiation
spaghettification and the aging of the
universe then your voice would be
forever silenced by gravity itself
all that is left is the slight mass
increase of the leviathan that consumed
you a mass increase that will only help
your captor pull in more victims
such is the fate of anyone or anything
unlucky enough to fall into the mouth of
a black hole
first mooted in 1783 the
incomprehensible horror of these
ultimate galactic predators has captured
the imagination of scientists and pushed
the boundaries of science for decades
indeed the supermassive variety are
thought to reside at the center of every
galaxy and may well be the agents of
their creation
while black holes can bring about
ultimate destruction their supermassive
counterparts can also feed and fuel the
very stuff of stars planets
and life
but many of these supermassive black
holes also leave us
with a mystery
just how did they get so big in the
first place
if they are the seeds of galaxies then
what were their seeds
and finally when and indeed what
were the first
black holes
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rain clutters harshly on the tin roof of
the rudimentary shelter
it is channeled down and collects into
the growing gutter of water that winds
its way through the muddy trench and
past the sodden boots of the young
soldiers who huddle for warmth beneath
the darkening december sky
the gunfire and shelling has mercifully
stopped for now and the senior
lieutenant ducks inside the little
refuge to turn his attention to the pile
of dispatches on the desk
it is 1915 on the eastern front of world
war one and the lieutenant
is karl
svartshield
smartshield is an accomplished theorist
and mathematician and the director of
the astronomical observatory in potsdam
even so the relentless pressures of the
great war see him sign up for the war
effort and squat in his great coat
alongside the harrowed soldiers of the
german army but tonight his attention is
caught by a familiar handwriting on the
wrappings of a bulky envelope instantly
he recognizes it as the hand of his
friend and colleague albert einstein
entitled the field equations of
gravitation the paper within lays out
the mathematical basis for what will
become known as the general theory of
relativity and all of our modern
understanding of gravity on cosmic
scales
incomprehensible to all but the most
involved theorists it describes an
elegant formulae how mata causes
space-time to curve and how space-time
tells mata how to move
svartshield holds the paper in trembling
hands and that evening risks a dim and
flickering electric light to read and
study einstein's work with delight the
circular reasoning of the scholars
equations may be mathematically elegant
but this also makes them notoriously
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