Kind: captions
Language: en
can you skate what we grow up hearing
about black lies in science fiction
novels there are sort of common day
things but the more I study black holes
the more mysterious in some ways they
become I'm Chun paid there are two types
of black holes one is the end stage of
massive stars stars ten times twenty
times the mass of the Sun eventually die
as a black hole the spectacular death
those are much more common but there are
hundreds and millions of them in our
galaxy and every galaxy out there those
are easy to make there's a second type
of black hole the type of black holes
were studying supermassive black holes
they go up to ten 20 billion times the
sun's mass they seem to live at the
center of every galaxy the one at the
center of our Milky Way at four million
times the sun's mass we're targeting the
most massive black holes at ten to
twenty billion times the Sun is mass and
clearly they have been eating something
to grow to that size one possibility is
direct collapse it skips the cycle of
stars the universe when it was younger
contain a lot more gas if you were able
to get a cloud of gas that had a mass of
hundred thousand suns
the collapses under gravity into a black
hole
in one shot
at the center of two galaxies we found
supermassive black holes about 20
billion suns
there are both bigger galaxies when the
galaxies are bigger the black holes are
bigger and generally speaking we find
bigger galaxies in larger clusters
clusters of hundreds to thousands of
galaxies they're like people they live
in cities like you know you look at the
earth and night you see San Francisco
you see New York but then there's vast
regions with very little light the same
thing with the sky we also see places
where there's hardly any galaxies one
would expect to find a giant black hole
at the center of a giant galaxy in a
spectacular cluster like finding a
skyscraper in Manhattan the one we found
five years ago isn't skyscraper in my
Hatton it's in a big cluster the one we
found a few months ago in Jesus 1600
also about 20 billion suns is like my
newest skyscraper in a small town in
Midwest
galaxies cannibalism
two galaxies come together merge making
a bigger galaxy
and forming this overwhelmingly large
black hole at the center of 1600
by its it's an elliptical galaxy
when you put two disks together when
they merged they form an elliptical
galaxy the most massive galaxies
so now we're pretty sure that you have
to have mergers of galaxies give them
enough time to form bigger and bigger
ones the Navy over 13 billion years the
cosmic history perhaps they can grow
supermassive black holes
20 billion times the sun's mass
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