One of the most mind-bending discoveries
we've ever made in space is black holes
a black hole is a place in space where
gravity pulls in so much that not even
light can escape the gravity is so
strong because the mat has been squeezed
into a tiny space black holes can be
caused when a star dies because no light
can escape this means they're totally
invisible and black and of course they
suck in anything that goes anywhere near
them so that begs the question what
would happen if two of these flat holes
collided this actually can and does
happen but what happens when it does and
what if it happened near to earth I'm
Charlie and today we're going to look at
what if two black holes collided but
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black holes can be big or small but one
of the most amazing kinds of black holes
are supermassive black holes these have
masses which range from millions or
billions of Suns place it at the center
of the most massive galaxies across our
universe and there are even some in our
galaxy the Milky Way what's interesting
is right now we don't know how
supermassive black holes come to be we
understand black holes but we don't know
how supermassive black holes get so big
one theory is it could happen form a
supernova a supernova is when a star
explodes blasting part of That star into
space but let's say something very
unlikely happens and two black holes
merge together this can sometimes happen
during a merger of galaxies this is
something we do see in our universe but
thankfully our galaxy the Milky Way has
not merged with another galaxy before if
two black holes collided they would
release gravitational waves these would
be fluctuations in the fabric of
space-time right now we can use
simulations to predict these merges
scientists have seen that these emit
both gravitational waves and radiation
that's because when the two black holes
collide interstellar gas prices from
them this creates very hot radioactive
waves when the black holes fall towards
one another they merge into one
this cosmic clash would be very bad for
any surrounding planets if it happened
to knit worth then radiation could take
out some of the human population it
would be like Chernobyl but in space
and about 10 million times worse right
now we actually don't have the
facilities to observe supermassive black
holes merging together scientists have
simply used simulations to see what
would happen but we do have the
technology to witness to normal black
holes merging together they can actually
see what's happening inside these black
holes the human eye can't see a black
hole because strong gravity pulls in all
of the light bird scientists can measure
how strong gravity affects the stars and
gas around the black hole they study the
Stars flying around or orbiting the
black hole and then work out what would
happen from them they study the stars
flying around or orbiting the black
holes and then using that data they work
out what's happening one theory is that
if two big black holes merge together
this could make a supermassive black
hole these are black holes which were
about ten times at the size of a normal
black hole the reason why this may
happen is because you're adding gravity
into more gravity it's kind of like the
video game agar dot IO if two worms
collide they merge into one even more
powerful worm and that's kind of a great
metaphor for black holes as they go
around galaxies zapping up anything near
them but on that note what happens to
the matter which is dragged into a black
hole where does it go and what happens
to it well to understand this you need
to know what the event horizon is the
event horizon is the space where light
can escape from the black hole's
gravitational field and a space where it
can't so basically where the matter does
and doesn't exist simultaneously the
matter in the event horizon becomes
isolated from the rest of time and space
it effectively disappears from the
universe that we existed once inside the
black hole the matter will be torn apart
into subatomic components if then
becomes stretched and squeezed until it
becomes a part of the black hole and
increases its size and that's how black
holes increase in size again kind of
like the game agar dot IO so hopefully
now you understand a bit more about this
mind-bending science humans know little
about it's kind of crazy to think black
holes break the space-time continuum but
they do but now it's time to make your
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