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Are These The Strangest Objects In The Universe?

54m 13s7,831 palavras1,282 segmentsEnglish

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0:02

The first sign would be small. [music]

0:06

Through a telescope, a single star would

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appear to split in two. Perhaps it would

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be dismissed as a mistake, an oddity

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caused by a problem with the lens. But

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then a few nights later, telescopes

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across the globe would [music] spy the

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same thing. Detectors around the world

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would notice increased levels of cosmic,

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UV, and gamma rays. Something energetic

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would be detected happening in the

0:30

nearby universe.

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Then would come the rumbling. To begin

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with, it would be subtle, noticed only

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by gravitational wave detectors. Strange

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ripples in space fitting no known

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template. An invisible approaching

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threat.

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But in time, we would see it stretching

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from one horizon to the other. As if it

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cut the universe in two, [music] it

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would pulse with exotic energies. When

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it whipsled onto itself, it would create

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an explosion brighter than a supernova.

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And indeed, by the time it became

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visible to the naked eye, it would

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already be too late.

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The universe holds close [music] its

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dark secrets. Beyond the boundaries of

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the known and familiar, past the

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protection of the sun, and the circling

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embrace of the Milky Way, lie relics of

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its ancient past, remnants [music]

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of the Big Bang itself.

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There are defects in the cosmos, and

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they have been here a long, long time.

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They were there in epochs of fire and

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unification at the beginning of

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everything. The long eras of splintering

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and fracturing, the chaos and violence

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before the universe as we know it took

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its final shape. They appear in our

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theories. We give them names. We assign

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them properties. [music]

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We ask how they might survive to the

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present day. How we might detect them

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through a subtle signature in this or

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that survey. We tell ourselves we are

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safe.

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But perhaps we are wrong.

2:25

In February 2011, Robonaut 2 became the

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first humanoid robot in space. Initially

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designed as a prototype [music] to be

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used on Earth, mission managers chose to

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send it to the International Space

2:36

Station after being impressed with its

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capability. It could be controlled

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remotely either by crew members aboard

2:42

the space station or even back on Earth

2:44

and was invaluable to engineers in

2:46

[music] demonstrating how dextrous

2:47

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[music]

3:55

We live in a broken universe and in 1983

3:59

physicists revealed a more perfect one.

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The laboratory [music] was called

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Underground Area 1. It sat outside the

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main detection chambers of CERN, the

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collection of massive particle colliders

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situated at the border of France and

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Switzerland. The main detector consisted

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of a series of cylinders almost 6 m long

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and over 2 m wide filled with ultra pure

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neutral argon and ethane gases. A

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complex zigzagging of 17,000 wires and

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over 6,000 sensors tracked the

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three-dimensional movement of any

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charged particles as they raced through

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the chamber. After years of development,

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the team at UA1 had hacked together a

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new kind of collider, one that combined

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protons and anti-rotons together at

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nearly the speed of light. With the

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machine in operation, the particles

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raced around kilometers of circular

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track, accelerating to higher energies

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with each pass, coming within

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centimeters of each other. Finally, at

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the last moment, right at the very

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limits that [music] the accelerators

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could achieve before their beams of

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particles drifted off course, the

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engineers initiated a carefully

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orchestrated sequence of events that

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brought the twin beams into collision

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precisely within the UA1 chamber.

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And for the barest fraction of a second,

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when the energies peaked and the

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collision ignited to its maximum

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intensity, a pure infant universe was

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born.

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This new universe was unbroken,

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symmetric. Strange particles sprung into

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existence. [music] the wires and

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detectors of the chamber briefly

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registering their exotic presence before

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they flashed away.

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But [music] this was no portal into

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another dimension.

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It was a window into our past.

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Few people anticipated what would happen

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on that fateful day in 1983.

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Some of them, like Peter [music] Higgs,

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are well known today with their names

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attached to Nobel prizes and

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international recognition. But some

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stayed out of the limelight, content to

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do their work regardless [music] of the

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promise of fame.

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By all accounts, [music]

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Sir Thomas Kibble was the gentleman's

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gentleman and the scientist's scientist.

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[music] He was kind, gregarious, and

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dignified. He delighted in his work, in

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the camaraderie of his peers, [music]

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and his ventures into the frontiers of

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physics. Indeed, in 2013, when Peter

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Higgs was awarded the Nobel Prize, he

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expressed regret that Kibble was not

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joining him. And yet, when asked his own

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opinion, Kibble simply shrugged. He was

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happy with what he had accomplished, he

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didn't need a gold medal to reap his

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rewards.

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But what was it that he had found? What

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was it that was confirmed in the fires

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of CERN in 1983?

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The theory of the Big Bang tells us that

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the universe was smaller, hotter, and

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denser in the past. Billions of years

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ago, the entire observable universe had

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a temperature of over a quadrillion

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degrees and was compressed into a volume

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no bigger than a peach. And Peter Higgs,

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Tom Kibble, and others discovered that

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at those insane energies, what we call

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the forces of nature take on an entirely

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different form.

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There are four fundamental forces that

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control everything within the universe.

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Gravity, electromagnetism, and the

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strong and weak nuclear forces which

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operate at atomic scales. At least there

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are usually four. For at high enough

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energies, [music] we know that two of

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these disperate forces merge together

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into a single unified hole. At extreme

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enough energy scales, there are no

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longer four forces of nature. There are

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only three. gravity, the strong force,

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and the electroeak force.

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This is a symmetry of nature exposed

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only at incredibly high energies. The

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electromagnetic and weak forces become

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two [music] sides of the same coin. The

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same way we view electricity and

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magnetism as two sides of

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electromagnetism.

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But this symmetry is broken in the

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everyday cosmos with some mechanism

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driving a wedge between them, making

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them appear and act as completely

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different forces.

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