When Will Time End?YouTube↗  IA↗(long shot)
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Time is flying by on this busy, crowded planet as life changes and evolves from second to
time is flying by on this busy crowded planet as life changes and evolves from
second.
second to second
At the same time, the arc of the human lifespan is getting longer: 67 years is the global
at the same time the arc of the human lifespan is getting longer 67 years is
average, up from just 20 years in the Stone Age.
the global average up from just 20 years in the Stone Age
Modern science provides a humbling perspective.
modern science provides a humbling perspective our lives
Our lives, indeed even that of the human species, are just a blip compared to the Earth, at
indeed even that of the human species are just a blip compared to the earth at
4.5 billion years and counting, and the universe, at 13.7 billion years.
4.5 billion years and Counting and the universe at 13.7 billion years it now
It now appears the entire cosmos is living on borrowed time.
appears the entire cosmos is living on borrowed time it may be a blip within a
It may be a blip within a much grander sweep of time. When, we now ask, will time end?
much grander sweep of time when we now ask will time end
Our lives are governed by cycles of waking and sleeping, the seasons, birth and death. Understanding time in cyclical terms connects us to the natural world, but it does not answer
our lives are governed by cycles of waking and sleeping the seasons birth and death understanding time in cyclical terms connects us to the natural world
but it does not answer the questions of
the questions of science. What explains Earth’s past, its geological eras and its ancient creatures?
science what explains Earth's past its geological eras and its ancient creatures and where did our world come
And where did our world come from? How and when will it end?
from how and when will it end
In the revolutions spawned by Copernicus and Darwin, we began to see time as an arrow,
in the revolutions spawned by Copernicus and Darwin we began to see time as an
in a universe that’s always changing.
arrow in a universe that's always changing
The 19th century physicist, Ludwig Boltzmann, found a law he believed governed the flight
the 19th century physicist Ludwig Boltzmann found a law he believed
of Time’s arrow.
governed the flight of times arrow
Entropy, based on the 2nd law of thermodynamics, holds that states of disorder tend to increase.
entropy based on the second law of thermodynamics holds that states of disorder tend to increase from neat
From neat, orderly starting points, the elements, living things, the earth, the sun, the galaxy. are all headed eventually to states of high entropy or disorder.
orderly starting points the elements living things the earth the Sun the galaxies are all headed eventually to states of high entropy or disorder
Nature fights this inevitable disintegration by constantly reassembling matter and energy
nature fights this inevitable disintegration by constantly reassembling matter and energy into
into lower states of entropy in cycles of death and rebirth.
lower states of entropy in cycles of death and rebirth will entropy someday
Will entropy someday win the battle and put the breaks on time’s arrow? Or will time, stubbornly, keep moving forward?
win the battle and put the brakes on times arrow or will time stubbornly keep moving forward we are observers and
We are observers, and pawns, in this cosmic conflict.
pawns in this cosmic conflict we seek
We seek mastery of time’s workings, even as the clock ticks down to our own certain end.
mastery of times workings even as the clock ticks down to our own certain end
Our windows into the nature of time are the mechanisms we use to chart and measure a changing
our windows into the nature of time are the mechanisms we use to chart and measure a changing universe from the
universe, from the mechanical clocks of old, to the decay of radioactive elements, or telescopes
mechanical clocks of old to the decay of radioactive elements or telescopes that
that measure the speed of distant objects.
measure the speed of distant objects our
Our lives move in sync with the 24-hour day, the time it takes the Earth to rotate once.
lives move in sync with the 24-hour day the time it takes the earth to rotate
Well, it’s actually 23 hours, 56 minutes and 4.1 seconds if you’re judging by the
once well it's actually 23 hours 56 minutes and 4.1 seconds if you're
stars, not the sun.
judging by the Stars not the Sun earth
Earth got its spin at the time of its birth, from the bombardment of rocks and dust that
got its spin at the time of its birth from the bombardment of rocks and dust
formed it.
that formed it
But it’s gradually losing it to drag from the moon’s gravity.
but it's gradually losing it to drag from the moon's gravity that's why in
That’s why, in the time of the dinosaurs, a year was 370 days, and why we have to add
the time of the dinosaurs a year was 370 days and why we have to add a leap
a leap second to our clocks about every 18 months. In a few hundred million years, we’ll gain a whole hour.
second to our clocks about every 18 months in a few hundred million years we'll gain a whole hour
The day-night cycle is so reliable that it has come to regulate our internal chemistry.
the day/night cycle is so reliable that it has come to regulate our internal chemistry the fading rays of the Sun
The fading rays of the sun, picked up by our retinas, set our so-called “circadian rhythms”
picked up by our retinas set our
in motion.
so-called circadian rhythms in motion
That’s when our brains begin to secrete melatonin, a hormone that tells our bodies
that's when our brains begin to secrete melatonin a hormone that tells our
to get ready for sleep. Finally, in the light of morning, the flow of melatonin stops.
bodies to get ready for sleep finally in the light of morning the flow of melatonin stops our blood pressure
Our blood pressure spikes… body temperature and heart rate rise as we move out into the world.
spikes body temperature and heart rate rise as we move out into the world our
Our days, and our lives, are short in cosmic terms. But with our minds, we have learned to follow time’s trail out to longer and longer intervals.
days and our lives are short in cosmic terms but without Minds we have learned to follow times trail out to longer and longer intervals we know for precise
We know from precise measurements that the Earth goes around the sun every 365.256366
measurements that the earth goes around the Sun every 365 point two five six
days.
three six six days much of the solar
Much of the solar energy that hits our planet is reflected back to space or absorbed by
energy that hits our planet is reflected back to space or absorbed by dust and
dust and clouds. The rest sets our planet in motion.
clouds the rest sets our planet in motion
You can see it in the ebb and flow of heat in the tropical oceans, the annual melting
you can see it in the annual melting and refreezing of ice at the polls in the
and refreezing of ice at the poles, or seasonal cycles of chlorophyll production in plants
ebb and flow of heat in the tropical oceans for seasonal cycles of chlorophyll production in plants on land
on land and at sea.
and at sea these cycles are embedded in
These cycles are embedded in still longer Earth cycles.
still longer Earth's cycles
Ocean currents, for example, are thought to make complete cycles ranging from four to
ocean currents for example are thought to make complete cycles ranging from
around sixteen centuries.
four to around sixteen centuries moving
Moving out in time, as the Earth rotates on its axis, it makes a series of interlocking
out in time as the Earth rotates on its axis it makes a series of interlocking
wobbles called Milankovich cycles.
wobbles called Milankovitch cycles they
They have been blamed for the onset of ice ages about every one hundred thousand years.
have been blamed for the onset of ice ages about every 100,000 years them
Then there’s the carbon cycle.
there's the carbon cycle plants capture
Plants capture it from the air or the sea.
it from the air of the sea it finds its
It finds its way into soils or ocean sediments as plants decay, or as waste passes out of
way into soils or ocean sediments as plants decay or as waste passes out of
the food chain.
the food chain it can take a volcanic
It can take a volcanic explosion, or a dramatic lowering of sea levels, to release this carbon
explosion or a dramatic lowering of sea levels to release this carbon back into
back into the air, often after millions of years.
the air often after millions of years
The processes that shape a planet like ours play only the smallest of roles in the evolution
the processes that shape a planet like ours play only the smallest of roles in
of the universe.
the evolution of the universe so to
So to glimpse time’s broader arcs, we must look to cycles that govern the larger cosmos.
glimpse times broader arcs we must look to cycles that govern the larger cosmos
The reigning theory is that the universe began in a sudden expansion of space, the big bang. With entropy uniformly low, this was the time of the tiny, subatomic particles like quarks
the reigning theory is that the universe began in a sudden expansion of space the Big Bang with entropy uniformly low this was the time of the tiny subatomic
particles like quarks and leptons
and leptons stirred into a hot soup.
stirred into a hot soup they combined
Within microseconds, they combined into atoms, setting in motion the primordial era.
into atoms setting in motion the primordial eel the universe cooled as it
The universe cooled as it ballooned, growing dim and falling into what’s known as the
ballooned glowing dim and falling into
cosmic dark ages.
what's known as the cosmic Dark Ages
All the while, though, gravity pulled particles together, fighting the expansion. After several hundred million years, larger clumps of matter had drawn together. These isolated pockets of gas became dense enough to heat up and ignite.
after several hundred million years larger clumps of matter had drawn together these isolated pockets of gas became dense enough to heat up and
So began the era of stars.
ignite so began the era of stars
In this glorious age, the universe seeded the rich cosmic landscapes we see in our telescopes.
in this glorious age the universe seeded the rich cosmic landscapes we see in our telescopes
Trillions upon trillions of stars lit up galaxies all across the cosmos.
trillions upon trillions of stars lit up galaxies all across the cosmos the Ark
The arc of this era is defined by the life cycles of stars, which vary according to their
of this era is defined by the life cycles of stars which vary according to
sizes. Stars shine because gravity crushes matter into their cores.
their sizes stars shine because gravity crushes matter into their cores the
The energy released pushes outward and balances the inward force of gravity.
energy released pushes outward and balances the inward force of gravity
This battle between energy and gravity is raging in stars all around the universe. But in large stars, about ten million years after their birth, gravity begins to gain
this battle between energy and gravity is raging in stars all around the universe but in large stars about 10 million years after their birth gravity
the edge and tips the balance.
begins to gain the edge
When the mass concentrating in the core of the star reaches a critical threshold, the
when the mass concentrating in the core of the star reaches a critical threshold
core collapses in on itself.
the core collapses in on itself the
The energy released in the collapse causes the star to explode in a blast of light and
energy released in the collapse causes the star to explode in a blast of light
debris that’s visible across the cosmos.
and debris that's visible across the cosmos
In the wake of this supernova, shock waves can cause nearby clouds of dust and gas to
in the wake of this supernova shockwaves can cause nearby clouds of dust and gas
collapse and ignite, to form generations of smaller stars like our Sun. A byproduct of star formation, solar systems form in the collapse of the surrounding solar
to collapse and ignite to form generations of smaller stars like our Sun a byproduct of star formation solar systems form in the collapse of the
nebula.
surrounding solar nebula the life cycle
The life cycle of planets, especially those in close, is tied to that of their parent stars.
of planets especially those in closed is tied to that of their parent stars as
As stars like our sun age, they grow hotter and more luminous.
stars like our Sun age they grow hotter and more luminous billions of years from
Billions of years from now, that will spell the beginning of the end for our home planet.
now that will spell the beginning of the end for our home planet as raging solar
As raging solar winds begin to blast away at our atmosphere, surface water will gradually
winds begin to blast away at our atmosphere surface water will gradually
disappear, rendering Earth uninhabitable.
disappear rendering earth uninhabitable
Finally, the sun will begin to swell, growing so large that it actually envelops the Earth.
finally the Sun will begin to swell growing so large that it actually envelops the earth friction with the
Friction with the Sun’s outer edges will cause this once blue world to gradually spiral inward.
sun's outer edges will cause this once blue world to gradually spiral inward
Unless they are large enough to go supernova, most stars end their lives in more of a whimper
unless they are large enough to go supernova most stars and their lives in
than a bang, as shown in this gallery of dying stars captured by the Hubble Space Telescope. In time, solar winds push their outer layers so far out that they blossom in spectacular
more of a whimper than a bang as shown in this gallery of dying stars captured by the Hubble Space Telescope in time solar winds push their outer
layers so far out they blossom in
displays. That’s just what happened about 12,000 years ago to the star that spawned the famed Helix Nebula.
spectacular displays that's just what happened about 12,000 years ago to the star that spawned the famed helix nebula
A vast glowing ring is the dying star’s outer layers. On the inside, spokes of denser gas stubbornly resist the star’s relentless winds. The star itself is now a dim, cooling remnant called a white dwarf.
on the inside spokes of denser gas stubbornly resist the Stars relentless winds the star itself is now a dim cooling remnant called a white dwarf
It’s the size of Earth, but about two hundred thousand times more dense.
it's the size of birth but about 200,000 times more dense this is likely what's
This is likely what’s in store for our sun.
in store for our Sun but distant
A distant civilization may scan it for planets, but by then they won’t see Earth.
civilization may scan it for planets but by then they won't see earth
This battle between energy and gravity repeats in every corner of a galaxy like ours, with gravity drawing gas clouds into stars, and stars burning themselves out on a variety
this battle between energy and gravity repeats in every corner of a galaxy like ours with gravity drawing gas clouds into stars and stars burning themselves
of time scales, depending on their size.
out on a variety of timescales in time
In time though, as the mass of the galaxy collects in successive generations of small
though as the mass of the galaxy collects in successive generations of
stars, it will grow dimmer and dimmer.
small stars it will grow dimmer and dimmer some
Some galaxies will see a temporary rebirth, if their mass gets stirred up and combined
galaxies will see a temporary rebirth if their mass gets stirred up and combined
with another. That’s what’s destined to happen to our Milky Way.
with another that's what's destined to happen to our Milky Way at just about
At just about the time our sun begins to swallow our planet, any remaining Earthlings will
the time our Sun begins to swallow our planet any remaining earthlings will see
see the stars of the Andromeda galaxy looming above the plane of our Milky Way. As shown in this simulation, the two are likely to tear each other apart.
the stars of the Andromeda galaxy looming above the plane of our Milky Way as shown in this simulation the two are likely to tear each other apart if it's
If it’s a direct hit, the stars in both galaxies will gradually join together in a
a direct hit the stars in both galaxies will gradually join together in a
gigantic galactic puffball known as an elliptical galaxy. All the turbulence of the merger could stimulate a wave of new stars being born, reinvigorating
gigantic galactic puff ball known as an elliptical galaxy all the turbulence of the merger could stimulate a wave of new stars being born reinvigorating the new
the new larger galaxy.
larger galaxy dust-ups like this in
Dust-ups like this, in which galactic neighbors merge, will be common as the era of stars
which galactic neighbors merge will be common as the era of stars moves into
moves into its later stages.
its later stages but a wholesale
But a wholesale thinning out of the universe is inevitable. On a grand scale, recent studies of the cosmic expansion rate show that the universe as a
thinning out of the universe is inevitable on a grand scale recent studies of the cosmic expansion rate show that the
whole is in no danger of succumbing to gravity, or of ending in a Big Crunch. In fact, over the last 6 billion years, the universe has begun to accelerate outward.
universe as a whole is in no danger of succumbing to gravity or of ending in a Big Crunch in fact over the last 6 billion years the
universe has begun to accelerate outward
Gravity is losing its grip to an unseen force called dark energy. You can see evidence of this now, out in the huge voids of space between filaments of galaxies.
gravity is losing its grip to an unseen force called dark energy you can see evidence of this now out in the huge voids of space between filaments of
These voids are like ever-expanding bubbles.
galaxies these voids are like ever-expanding bubbles where the bubble
Where the bubble walls touch you can see filaments of galaxies. As the bubbles grow, the filaments will stretch and break.
walls touch you can see filaments of galaxies as the bubbles grow the filaments will stretch and break the
The distance between galaxies will widen at a faster and faster pace. Eventually, no matter where you are in the universe, you will see only a few isolated
distance between galaxies will wipe at a faster and faster pace eventually no matter where you are in the universe you will see only a few isolated clusters of
clusters of galaxies huddled together, with little connection to anything else, and few
galaxies huddled together with little connection to anything else and few
clues to how they got there.
clues to how they got there
At more distant reaches of time, tens of billions of years from now, the sky will grow darker
at more distant reaches of time tens of billions of years from now the sky will
and darker as everything recedes away from everything else. A good place to be, in those long twilight years of the stellar era, is a place where
grow darker and darker as everything recedes away from everything else a good place to be in those long twilight years of the stellar era is a place where
gravity and energy have forged an extended truce. Perhaps a place like this: not much larger than our planet Jupiter, a Red Dwarf is one
gravity and energy have forged an extended truce perhaps a place like this not much larger than our planet Jupiter a red dwarf is one of the smallest and
of the smallest and dimmest stars in our universe.
dimmest stars in our universe they have
They have been shown to harbor planets close enough that their dim rays can sustain liquid
been shown to harbor planets close enough that they are dim rays can
water, and life.
sustain liquid water and life brown
Brown dwarfs and red dwarfs form the vast majority of stars in our galaxy.
dwarfs and red dwarfs form the vast majority of stars in our galaxy
In fact, combined, their mass exceeds that of all the large stars.
in fact combined their mass exceeds that of all the large stars because they burn
Because they burn so slowly, they’ll be the final beacons of the majestic age of stars,
so slowly there'll be the final beacons of the majestic age of stars an era that
an era that will extend out to one hundred trillion years.
will extend out to 100 trillion years
Even as their host galaxies grow dim, another process will begin to transform these small
even as their host galaxies grow dim another process will begin to transform
outposts.
these small outposts
Over time, chance encounters between objects will perturb their orbits, sending some toward
over time chance encounters between objects will preserve their orbits sending some toward the center of the
the center of the galaxy, and others out into the void.
galaxy and others out into the void in
In this way, galaxies may gradually evaporate, with ever-denser concentrations of matter
this way galaxies may gradually evaporate with ever denser concentrations of matter accumulating in
accumulating in their cores. As that happens, the universe begins to take on a new character.
their cores as that happens the universe begins to take on a new character
Welcome to the degenerate era, in which the universe is populated by red and white dwarf
welcome to the degenerate era in which the universe is populated by red and
stars, steadily cooling, and by the charred remains of supernova explosions: neutron stars.
white dwarf stars steadily cooling and by the charred remains of supernova explosions neutron stars
Even though these dead stars have used up their nuclear fuels, they continue to produce
even though these dead stars have used up their nuclear fuels they continued to
small amounts of energy.
produce small amounts of energy they
They scoop up and annihilate dark matter particles that manage to stray into their grasp.
scooped up and annihilate dark matter particles that managed to stray into their grasp
Here is where cosmic evolution slows to a crawl.
here is where cosmic evolution slows to a crawl
It’s expected that protons, the building blocks of all atoms, will slowly degrade,
it's expected that protons the building blocks of all atoms will slowly degrade
turning into sub-atomic particles that then decay into photons.
turning into subatomic particles that then decay into photons
All the protons in existence date back to the early moments of the universe.
all the protons in existence date back to the early moments of the universe
Their eventual decay will mark the end of the degenerate era, around a billion, billion, billion, billion years after the big bang.
their eventual decay will mark the end of the degenerate era around a billion billion billion billion years after the
That’s a one followed by 40 zeros.
Big Bang that's a 1 followed by 40 zeroes our picture of what happens after
Our picture of what happens after that depends on what we learn in the coming years beneath
that depends on what we learn in the coming years beneath the border of
the border of France and Switzerland, in one of the largest physics experiments ever undertaken. 100 meters underground, the Large Hadron Collider was built to accelerate particles in opposite
France and Switzerland in one of the largest physics experiments ever undertaken 100 meters underground the Large Hadron Collider was built to
accelerate particles in opposite
directions through a giant ring 27 kilometers around.
directions through a giant ring 27 kilometers around when they reach nearly
When they reach nearly the speed of light, scientists will bring them into ferocious
the speed of light scientists will bring
collisions.
them into ferocious collisions one goal
One goal: to define the final time horizons of our universe, as well as the final moments
to define the final time horizons of our universe as well as the final moments of
of its most persistent objects.
its most persistent objects
Black holes, ranging from million to tens of billions of times the mass of our sun,
black holes ranging from millions to tens of billions of times the mass of
occupy the centers of large galaxies today.
our Sun occupy the Centers of large galaxies today as those galaxies age
As those galaxies age, over trillions of years of time, much of their mass will spiral towards
over trillions of years of time much of their mass was spiraled toward the
the center and into the jaws of ever more ravenous black holes.
center and into the jaws of ever more ravenous black holes
Conceivably, these black holes could end up weighing as much as a galaxy.
conceivably these black holes could end up weighing as much as a galaxy but when
But when they finally stop growing, will they too be subject to the ravages of time?
they finally stopped growing will they to be subject to the ravages of time
According to the physicist Stephen Hawking, the answer is yes.
according to the physicist Stephen Hawking the answer is yes he proposed a
He proposed a theoretical process of decay that scientists are hoping to test in high-energy
theoretical process of decay that scientists are hoping to test in
particle collisions at the Large Hadron Collider. The idea is that, throughout our universe, particles of opposite charge constantly well
high-energy particle collisions at the Large Hadron Collider the idea is that throughout our universe particles of opposite charge constantly well up in
up in the vacuum of space.
the vacuum of space they normally
They normally destroy each other. But when this happens at the event horizon of a black hole, one particle can be pulled
destroy each other but when this happens at the event horizon of a black hole one
in while the other escapes.
particle can be pulled in while the other escapes that has the effect of
That has the effect of slowly siphoning energy and mass from the hole. If this is true, then even black holes are eventually doomed.
slowly siphoning energy and mass from the hole if this is true then even black holes are eventually doomed
But finding out for sure is not easy.
but finding out for sure is not easy
Creating a micro black hole, it seems, will take more energy than any Earth-bound collider can pack.
creating a micro black hole it seems will take more energy than any earthbound Collider can pack that is
That is, unless there’s more to nature and to gravity than we’ve thought.
unless there's more to nature into gravity than we've thought the key lies
The key lies in whether the universe we know is part of a more complex cosmic reality,
in whether the universe we know is part of a more complex cosmic reality beyond
beyond the three spatial dimensions - plus time - that we experience in our everyday lives.
the three spatial dimensions plus time that we experience in our everyday lives
We may be like an insect living on the two-dimensional surface of a pond, unaware of the deep and
we may be like an insect living on the two-dimensional surface of a pond unaware of the deep and complex reality
complex reality below it.
below it
It may be possible that an unseen extra dimension could intersect our world on an extremely
it may be possible that an unseen extra dimension could intersect our world on
tiny scale.
an extremely tiny scale according to
According to some scientists, when particles collide at very high energies, the additional
some scientists when particles collide at very high energies the additional
gravity needed to create a micro black hole could come from the extra dimension.
gravity needed to create a micro black hole could come from the extra dimension
They’ll know a black hole is there when they see the shower of particles predicted
they'll know a black hole is there when they see the shower of particles
by Hawking’s theory.
predicted by Hawking's theory its
Its presence will open a brief window to a deeper cosmic reality, while shedding light
presence will open a brief window to a deeper cosmic reality while shedding
on the ultimate future of our universe.
light on the ultimate future of our universe based on Hawking's theory a
Based on Hawking’s theory, a black hole observed today will take it last gasp when
black hole observed today will take its
the clock strikes 10 to the hundredth years from now, a number known as a googol. That’s the end of the universe as we know it.
last gasp when the clock strikes ten to the hundredth years from now a number known as a Google that's the end of the universe as we know it but look beyond
But look beyond that to, say, 10 to the googol, a googolplex, years? If you wrote all the zeroes in that number in tiny 1-point font, it would stretch beyond
that to say 10 to the Google a googolplex years if you wrote all the zeros in that number in tiny one point font it would stretch beyond the
the observable universe.
observable universe will the great arrow
Will the great arrow of time have come to rest by then?
of time have come to rest by them not if
Not if modern theories are correct.
modern theories are correct they hold
They hold that our universe is part of a much larger cosmic cycle of birth and death, with
that our universe is part of a much larger cosmic cycle of birth and death
whole new universes coming into being in the space beyond our own.
with whole new universes coming into being in the space beyond our own
The time horizons of our universe may well be a blip in this grander scheme of things. Back to Earth now.
the time horizons of our universe may well be a blip in this grander scheme of things back to earth now
We are products of the great era of stars, and witnesses to its great spectacles of gravity and energy.
we are products of the great era of stars and witnesses to its great spectacles of gravity and energy no
No doubt there are other beings somewhere out there who are attempting to comprehend
doubt there are other beings somewhere out there for attempting to comprehend
the universe.
the universe they too may invent the
They too may invent the idea of “time” and develop their own theories on where it’s all leading.
idea of time and develop their own theories on where it's all leading their
Their discoveries - and ours – will not survive the entropy at work in the universe,
discoveries and ours will not survive the entropy at work in the universe as
as we all go the way of the stars, and as they give way to grand new eras in the life
we all go the way of the stars and as
of the universe. And as our universe gives way to grand new eras in the life of the cosmos. 6
our universe gives way to grand new eras in the life of the cosmos
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