[Music] there are places in the universe where
there are places in the universe where
there are places in the universe where gravity dramatically distorts space-time
gravity dramatically distorts space-time
gravity dramatically distorts space-time most of space-time is nearly flat that
most of space-time is nearly flat that
most of space-time is nearly flat that is only in black holes had a strongly
is only in black holes had a strongly
is only in black holes had a strongly warp professor Stephen Hawking is
warp professor Stephen Hawking is
warp professor Stephen Hawking is renowned as a world expert on black
renowned as a world expert on black
renowned as a world expert on black holes
holes
holes back in the 1970s his groundbreaking
back in the 1970s his groundbreaking
back in the 1970s his groundbreaking research brought much attention to the
research brought much attention to the
research brought much attention to the then theoretical black hole the
then theoretical black hole the
then theoretical black hole the gravitational pull of a black hole
gravitational pull of a black hole
gravitational pull of a black hole stretches and warps space-time around it
stretches and warps space-time around it
stretches and warps space-time around it to an incredibly deep cone-shaped hole
when scientists analyzed x-ray images of
when scientists analyzed x-ray images of supermassive black holes they discovered
supermassive black holes they discovered
supermassive black holes they discovered that they were spinning at close to the
that they were spinning at close to the
that they were spinning at close to the speed of light
this causes the space-time fabric to be
this causes the space-time fabric to be dragged around scientists call this
dragged around scientists call this
dragged around scientists call this frame dragging space-time becomes so
frame dragging space-time becomes so
frame dragging space-time becomes so distorted that it forms an almost
distorted that it forms an almost
distorted that it forms an almost complete circle
confirmation that black holes rotate was
confirmation that black holes rotate was music to the ears of anyone interested
music to the ears of anyone interested
music to the ears of anyone interested in time travel the time traveler was
in time travel the time traveler was
in time travel the time traveler was just about to strike gold Richard Gott
just about to strike gold Richard Gott
just about to strike gold Richard Gott is a professor of astrophysics here at
is a professor of astrophysics here at
is a professor of astrophysics here at Princeton University he searched the
Princeton University he searched the
Princeton University he searched the universe to find anything that could
universe to find anything that could
universe to find anything that could warp space-time as much as a rotating
warp space-time as much as a rotating
warp space-time as much as a rotating black hole what he found led him to make
black hole what he found led him to make
black hole what he found led him to make a bold and ambitious hypothesis which is
a bold and ambitious hypothesis which is
a bold and ambitious hypothesis which is based on something that is still
based on something that is still
based on something that is still theoretical it’s called
theoretical it’s called
theoretical it’s called a cosmic string cosmic strings are thin
a cosmic string cosmic strings are thin
a cosmic string cosmic strings are thin threads of energy that are left over
threads of energy that are left over
threads of energy that are left over after the Big Bang
despite being no wider than an atom
despite being no wider than an atom cosmic strings have colossal density a
string just one yard long would exert
string just one yard long would exert more gravity than the earth immense
more gravity than the earth immense
more gravity than the earth immense gravity warps space-time
gravity warps space-time
gravity warps space-time with his eye on time travel that means
with his eye on time travel that means
with his eye on time travel that means one thing for richard gott please enjoy
one thing for richard gott please enjoy
one thing for richard gott please enjoy your meal i found out that because of
your meal i found out that because of
your meal i found out that because of the warping that the strings do in
the warping that the strings do in
the warping that the strings do in space-time that if two strings infinite
space-time that if two strings infinite
space-time that if two strings infinite strings were passing each other at high
strings were passing each other at high
strings were passing each other at high speed like this you could use them to
speed like this you could use them to
speed like this you could use them to make a time machine the fast-moving
make a time machine the fast-moving
make a time machine the fast-moving strings warp space-time as they pass so
strings warp space-time as they pass so
strings warp space-time as they pass so that they bend it down into a wedge
that they bend it down into a wedge
that they bend it down into a wedge shape normally a spaceship would have to
shape normally a spaceship would have to
shape normally a spaceship would have to take the longer route across space-time
but the time traveler can now take the
but the time traveler can now take the shortcut by outrunning a light beam he
shortcut by outrunning a light beam he
shortcut by outrunning a light beam he can travel back in time if this car were
can travel back in time if this car were
can travel back in time if this car were a huge spaceship and God could find two
a huge spaceship and God could find two
a huge spaceship and God could find two cosmic strings he could return before he
cosmic strings he could return before he
cosmic strings he could return before he departs the space-time around the two
departs the space-time around the two
departs the space-time around the two moving cosmic strings is so twisted that
moving cosmic strings is so twisted that
moving cosmic strings is so twisted that God can circle the strings and come back
God can circle the strings and come back
God can circle the strings and come back before he sets off here’s how cosmic
before he sets off here’s how cosmic
before he sets off here’s how cosmic strings bend space-time and provide a
strings bend space-time and provide a
strings bend space-time and provide a shortcut by journeying around the
shortcut by journeying around the
shortcut by journeying around the strings God travels faster than light
strings God travels faster than light
strings God travels faster than light does across normal space-time you can’t
does across normal space-time you can’t
does across normal space-time you can’t build a rocket that goes faster than the
build a rocket that goes faster than the
build a rocket that goes faster than the speed of light but with curved
speed of light but with curved
speed of light but with curved space-time you can take a shortcut and
space-time you can take a shortcut and
space-time you can take a shortcut and beat the light beam and theoretically
beat the light beam and theoretically
beat the light beam and theoretically make a time machine in principle the
make a time machine in principle the
make a time machine in principle the path of time is no longer linear
Richard God’s time machine does however
Richard God’s time machine does however have a weak link he discovered that at
have a weak link he discovered that at
have a weak link he discovered that at the very moment he warped space-time
the very moment he warped space-time
the very moment he warped space-time enough to form a circle the whole region
enough to form a circle the whole region
enough to form a circle the whole region would fall inside a black hole and
would fall inside a black hole and
would fall inside a black hole and that’s not good because a black hole
that’s not good because a black hole
that’s not good because a black hole well that’s a hotel where you check in
well that’s a hotel where you check in
well that’s a hotel where you check in but you don’t check out so it looks like
but you don’t check out so it looks like
but you don’t check out so it looks like the the time travel region would be
the the time travel region would be
the the time travel region would be trapped inside a rotating black hole
time-travel theories may sound
time-travel theories may sound far-fetched yet for the last century
far-fetched yet for the last century
far-fetched yet for the last century pioneers have pushed the boundaries
pioneers have pushed the boundaries
pioneers have pushed the boundaries turning science fiction into reality
they have blended imagination with
they have blended imagination with knowledge to prove once and for all that
knowledge to prove once and for all that
knowledge to prove once and for all that time travel will happen we may have only
time travel will happen we may have only
time travel will happen we may have only journeyed a fraction of a second into
journeyed a fraction of a second into
journeyed a fraction of a second into the future but the time travel pioneers
the future but the time travel pioneers
the future but the time travel pioneers continue undeterred driven by the
continue undeterred driven by the
continue undeterred driven by the knowledge that every epic adventure
knowledge that every epic adventure
knowledge that every epic adventure begins with a single step
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