쉐도잉 연습: Every Way Time Travel Could Work Explained in 9 Minutes - 영상으로 영어 말하기 배우기

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Speed time dilation.

Imagine two identical twins.

One remains on Earth, while the other boards a spacecraft traveling at 99 % of light speed.

For every year experienced by the astronaut, roughly seven years pass on Earth.

When the astronaut returns, they are genuinely younger than their twin.

This happens because time does not pass at the same rate for objects moving at different speeds.

The faster you travel, the more slowly your time passes compared with someone who remains behind.

A traveler could therefore reach Earth's distant future

while aging by only a few decades

but instead of pushing the spacecraft close to the speed of

light you could make it orbit something with extremely powerful gravity

this is gravitational time travel imagine the same twins again one remains on earth

while the other orbits close to a supermassive black hole the black hole's gravity bends the space

and time surrounding it the closer the spacecraft moves towards it

the more slowly time passes inside the ship compared with the

twin farther away the astronaut would still feel completely normal their clock heartbeat

and aging would continue at the usual rate from their own point of view.

But after leaving the black hole and returning, they could discover that decades had passed for their twin, while they had experienced only months.

This happens because gravity does more than pull objects towards the black hole.

It also bends time around it.

Think of space -time like a stretched sheet.

Place something extremely heavy in the middle, and the sheet sinks into a deep dip.

The closer the spacecraft moves towards it, the deeper it travels into this warped region.

But what if we slow down the traveler instead?

This leads to the next method, suspended animation.

Instead of slowing time, we slow your body so you experience almost none of it.

This method would require your body temperature to be lowered, your heartbeat reduced, and the chemical reactions inside your cells slowed to a crawl.

With your body using far less energy, it could remain preserved for much longer than an awake human could survive.

Think of it like placing food inside a freezer.

The freezer does not stop time, but it slows the processes that cause the food to decay.

You could enter a chamber, remain unconscious for decades, and wake up having barely experienced the journey.

But this is not true time travel.

Time outside the chamber continues normally, and your body is still physically present for every year that passes.

The method only allows you to skip the waiting.

The problem is that human cells are easily damaged by extreme cold, ice formation, and long periods without normal circulation.

But this method only lets you travel forward in time.

To travel backwards, you would need a shortcut that connects two different moments in time.

That leads to the first method capable of reaching the past.

Wormhole time travel.

Imagine drawing two points on a sheet of paper.

One represents Earth today, while the other represents Earth 10 years ago.

Normally, there is no path between them, but if space -time could fold until those two points touched, a tunnel could connect them directly.

You could enter one side in the present, travel through the shortcut, and leave through the other side in the past.

The problem is keeping that path open.

Gravity would normally crush the tunnel shut before anything could pass through it.

Some theories suggest it would need a strange type of energy that pushes the walls apart, but we do not know whether enough of this energy can exist.

But what if, instead of cutting a shortcut through space -time, we created a machine that twists the fabric of space and time itself?

That leads to the next method, the Tipler Cylinder.

A Tipler cylinder is a theoretical time machine made from a gigantic spinning tube.

To picture it, stand beside a chair and walk one full circle around it.

You return to the same spot but at a later point in time.

Now imagine the chair spinning so fast that it twists the floor around it into a whirlpool.

Each time you walk around, the twisted floor pulls your path backwards slightly.

A Tipler cylinder would do something similar to space and time.

The cylinder would need to be incredibly long, extremely heavy and spinning almost as fast as light.

As it turns, it would twist space -time around itself.

A spacecraft could circle the cylinder and follow this twisted path.

Normally, it would return to the same place later.

But if space -time were twisted enough, it could return before the journey began.

The next method uses something that may already exist.

These are cosmic strings.

Despite the name, these would not be physical strings.

Cosmic strings are incredibly thin lines of trapped energy, possibly left behind when the early universe formed.

Each string would change the shape of the space around it.

Imagine a long brick wall, remove one thin vertical slice, then pull the two remaining sides together and join them.

The wall still looks complete, but it now contains fewer bricks.

Traveling around it would therefore take slightly less distance than before.

A cosmic string would do something similar to space it would

remove a tiny wedge from its usual shape then join the remaining edges together

but the next method does not search for distorted space it

creates its own this is the warp drive method you sit inside your spacecraft

and activate the warp drive the engines do not push you

forwards instead space begins shrinking in front of the ship

and expanding behind it your spacecraft remains inside a calm bubble

while the universe moves around you like standing still on a conveyor belt

that carries the floor beneath your feet the real problem begins

when two carefully arranged warp bubbles move in different directions and reference frames.

Together, they could form a closed route through space -time.

You leave Earth, enter the first bubble, transfer into the second, and arrive home before the first engine was activated.

You might see technicians still preparing the ship you have already returned in, but a warp drive carries distorted space with the ship.

The next method leaves the shortcut behind, the Krasnikov tube.

A Krasnikov tube would create a permanent shortcut through space -time.

Unlike a warp bubble, the shortcut would not move with the spacecraft.

Instead, the first ship must travel normally towards a distant star, changing the space along the route behind it.

Think of digging a railway tunnel through a mountain.

The first journey is slow because the tunnel does not exist yet.

But once completed, every return journey can use the shorter route.

A Krasnikov tube would work in a similar way.

Inside the tunnel, space would be shaped so

that the spacecraft could return to Earth much faster than light could travel through normal space.

One tube only creates a rapid return route, but two tubes built along different paths could form a complete loop.

A spacecraft could travel through one tube, return through the other, and arrive on Earth before it originally departed.

The problem is that the tube would require strange negative energy spread along its walls, and we do not know how to create or control enough of it.

But the next method does not send a spacecraft into the past.

It sends a message.

This is a tachyon antitelephone.

This is a theoretical method of sending a message into the past using something that travels faster than light.

The signal could be carried by hypothetical particles called tachyons, which would always move faster than light.

Imagine sending a message to a spacecraft moving away from Earth.

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Because the signal travels faster than light, the order of events can become twisted.

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From the spacecraft's point of view, the message may arrive before Earth sent it.

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The spacecraft could then send a faster -than -light reply back.

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That reply could reach Earth before the original message was written.

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Your phone could ring with a warning from the future, telling you not to send a message you have not typed yet.

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But if you follow the warning and never send it, why was the warning sent back?

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This is the main problem.

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The anti -telephone could create a message that prevents its own existence.

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Tachyons have never been discovered, and physics may forbid faster -than -light information entirely.

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But the next method does not use a signal traveling through normal space.

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It sends a particle into a loop where it can meet its own past.

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This is the quantum time loop method.

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Imagine rolling a ball into a tunnel.

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A few seconds before the ball enters, an older copy rolls out of the other side.

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Both versions now exist at the same time.

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But what happens if the older ball blocks the younger one from entering the tunnel?

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If the younger ball never enters, the older ball could never have appeared to block it.

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The older particle may only interfere in a way that still allows its younger version to enter the loop.

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Other models suggest several possible outcomes could exist at once, with only the self -consistent result surviving.

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This means the particle could interact with its own past

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but it could never create an impossible history

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so far scientists have only simulated this behavior with quantum systems nothing has actually been sent backwards through time

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but the next method would create a much larger loop by

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bending space -time inside an enormous ring the ori time machine imagine a machine

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that could create a loop through time inside an enormous donut

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-shaped region of space at the center would be an empty

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ring surrounded by matter arranged to bend space time in a

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precise way as the space time inside the ring changes ordinary circular paths could eventually become paths into the past.

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Think of driving around a roundabout.

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Normally, each lap brings you back to the same place a few seconds later.

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Inside the Ori time machine, spacetime would be bent so strongly that each lap could bring you back to the same place a few seconds earlier.

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Keep circling, and you could travel farther into the past.

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Unlike many time machine designs, the original model does not require negative energy matter around its empty core.

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However, nobody knows whether the structure could be built or remain stable once the time loops begin forming.

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But the final method needs no tunnel, cylinder, or ring.

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It requires the entire universe to rotate.

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The Godel Universe.

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You launch your spacecraft and travel forwards through space.

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There is no wormhole waiting ahead.

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No cylinder spins beside you, and your ship never breaks the speed of light.

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You simply continue traveling around the universe.

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But this universe is rotating, not galaxies spinning inside space.

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The structure of space -time itself has a global rotation built into it.

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That rotation tilts the directions leading towards the future until a

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sufficiently large path can curve all the way back towards the past.

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Imagine walking forwards along the surface of Earth.

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You never turn around, yet eventually the curve of the planet brings you back to where you started.

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Now replace the surface of Earth with space -time.

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You complete the journey and return not only to the same location, but to an earlier moment.

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You could watch your own spacecraft, preparing to launch.

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The disturbing part is that nothing locally appeared to go wrong.

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You always moved forwards.

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Every clock aboard the ship ticked normally.

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The universe simply connected your future to your past.

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Our universe does not appear to rotate in the way required by Godel's model, so this is not a route available to us.

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But the equations show that general relativity can describe entire universes where time is not a straight road.

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It is a landscape containing paths that lead back to places you have already lived.

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If you guys had a time machine, where would you travel to?

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Let me know in the comments below.

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핵심 어휘 및 구문

Time dilation: 시간 팽창 (시간이 다른 속도로 흐르는 현상)
Gravitational: 중력의 (중력과 관련된)
Suspended animation: 현탁 애니메이션 (생체 활동을 최소화하는 상태)
Wormhole: 웜홀 (시공간의 단축 통로)
Tipler Cylinder: 티플러 실린더 (이론적인 시간 기계)
"The faster you travel, the more slowly your time passes": 더 빨리 움직일수록 시간이 더 느리게 흐릅니다 (비교구문 연습에 좋음)

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수동태 be + 과거분사 — 누가 하는지보다 무슨 일이 일어나는지에 초점	be lowered · are easily damaged · were twisted
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쉐도잉 연습: Every Way Time Travel Could Work Explained in 9 Minutes - 영상으로 영어 말하기 배우기

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