Yes, scientists are actually building an elevator to space - Fabio Pacucci

791,456 views ใƒป 2021-12-07

TED-Ed


์•„๋ž˜ ์˜๋ฌธ์ž๋ง‰์„ ๋”๋ธ”ํด๋ฆญํ•˜์‹œ๋ฉด ์˜์ƒ์ด ์žฌ์ƒ๋ฉ๋‹ˆ๋‹ค.

๋ฒˆ์—ญ: riddler edward ๊ฒ€ํ† : DK Kim
00:08
Sending rockets into space requires sacrificing expensive equipment,
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๋กœ์ผ“์„ ์šฐ์ฃผ๋กœ ๋ฐœ์‚ฌํ•˜๋ ค๋ฉด ๋น„์‹ผ ์žฅ๋น„๋ฅผ ์จ์•ผ ํ•˜๋ฉฐ
00:14
burning massive amounts of fuel, and risking potential catastrophe.
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์—ฐ๋ฃŒ๊ฐ€ ๋งŽ์ด ํ•„์š”ํ•˜๊ณ , ์ฐธ์‚ฌ๊ฐ€ ๋ฐœ์ƒํ•  ์ˆ˜๋„ ์žˆ์Šต๋‹ˆ๋‹ค.
00:18
So in the space race of the 21st century,
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21์„ธ๊ธฐ ์šฐ์ฃผ ๊ฐœ๋ฐœ ๊ฒฝ์Ÿ์—์„œ,
00:21
some engineers are abandoning rockets for something much more exciting:
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์–ด๋–ค ๊ธฐ์ˆ ์ž๋“ค์€ ๋กœ์ผ“์„ ๋ฒ„๋ฆฌ๊ณ  ํ›จ์”ฌ ํฅ๋ฏธ์žˆ๋Š” ๊ฒƒ์„ ์ฐพ์•˜์Šต๋‹ˆ๋‹ค.
00:26
elevators.
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๋ฐ”๋กœ ์Šน๊ฐ•๊ธฐ์ฃ .
00:28
Okay, so maybe riding an elevator to the stars
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๋ฌผ๋ก  ๋ณ„๊นŒ์ง€ ์Šน๊ฐ•๊ธฐ๋ฅผ ํƒ€๊ณ  ๊ฐ€๋Š” ๊ฒŒ
00:31
isn't the most thrilling mode of transportation.
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๊ฐ€์žฅ ์‹ ๋‚˜๋Š” ๊ตํ†ต์ˆ˜๋‹จ์€ ์•„๋‹ ๊ฒ๋‹ˆ๋‹ค.
00:34
But using a fixed structure to send smaller payloads
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ํ•˜์ง€๋งŒ ๊ณ ์ •๋œ ๊ตฌ์กฐ๋ฌผ์„ ์ด์šฉํ•ด์„œ
์šฐ์ฃผ๋น„ํ–‰์‚ฌ์™€ ์žฅ๋น„ ๊ฐ™์€ ์ž‘์€ ํ™”๋ฌผ์„ ๊ถค๋„๋กœ ๋ณด๋‚ด๋Š” ๋ฐฉ์‹์€
00:37
of astronauts and equipment into orbit
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00:40
would be safer, easier, and cheaper than conventional rockets.
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์ „ํ†ต์ ์ธ ๋กœ์ผ“๋ณด๋‹ค ์•ˆ์ „ํ•˜๊ณ  ์‰ฌ์šฐ๋ฉฐ ์ €๋ ดํ•œ ๋ฐฉ์‹์ž…๋‹ˆ๋‹ค.
00:45
On a SpaceX Falcon 9 rocket,
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์ŠคํŽ˜์ด์ŠคX ํŒฐ์ปจ 9 ๋กœ์ผ“์˜ ๊ฒฝ์šฐ,
00:47
every kilogram of cargo costs roughly $7,500 to carry into orbit.
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1kg์˜ ํ™”๋ฌผ์„ ๊ถค๋„๋กœ ๋ณด๋‚ด๋Š” ๋ฐ 7์ฒœ5๋ฐฑ ๋‹ฌ๋Ÿฌ๊ฐ€ ํ•„์š”ํ•ฉ๋‹ˆ๋‹ค.
00:55
Space elevators are projected to reduce that cost by 95%.
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์šฐ์ฃผ ์Šน๊ฐ•๊ธฐ๋Š” ์ด ๋น„์šฉ์„ 75%๊นŒ์ง€ ์ค„์ผ ๊ฒƒ์œผ๋กœ ์˜ˆ์ƒ๋ฉ๋‹ˆ๋‹ค.
01:00
Researchers have been investigating this idea since 1895,
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์—ฐ๊ตฌ์›๋“ค์€ 1895๋…„๋ถ€ํ„ฐ ์ด ๋ฐฉ๋ฒ•์— ๋Œ€ํ•ด ์กฐ์‚ฌํ•ด ์™”์œผ๋ฉฐ,
01:05
when a visit to what was then the world's tallest structure
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์ •ํ™•ํžˆ๋Š” ๋Ÿฌ์‹œ์•„์˜ ๊ณผํ•™์ž์ธ ์ฝ˜์Šคํƒ„ํ‹ด ์น˜์˜ฌ์ฝฅ์Šคํ‚ค๊ฐ€
01:08
inspired Russian scientist Konstantin Tsiolkovsky.
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๊ทธ ๋‹น์‹œ ๊ฐ€์žฅ ๋†’์€ ๊ฑด๋ฌผ์„ ๊ตฌ๊ฒฝํ•˜๋‹ค ์˜๊ฐ์„ ๋ฐ›์€ ๋•Œ๋ถ€ํ„ฐ์ž…๋‹ˆ๋‹ค.
01:12
Tsiolkovsky imagined a structure thousands of kilometers tall,
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์น˜์˜ฌ์ฝฅ์Šคํ‚ค๋Š” ์ˆ˜์ฒœ km ๋†’์ด์˜ ๊ตฌ์กฐ๋ฌผ์„ ์ƒ์ƒํ–ˆ์ง€๋งŒ,
01:16
but even a century later, no known material is strong enough
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1์„ธ๊ธฐ๊ฐ€ ์ง€๋‚œ ํ›„์—๋„,
๊ทธ๋Ÿฐ ๊ฑด๋ฌผ์„ ์ง€์ง€ํ•  ์ˆ˜ ์žˆ์„ ์ •๋„๋กœ ํŠผํŠผํ•œ ์žฌ๋ฃŒ๋ฅผ ์ฐพ์ง€ ๋ชปํ–ˆ์Šต๋‹ˆ๋‹ค.
01:21
to support such a building.
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01:23
Fortunately, the laws of physics offer a promising alternative design.
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๋‹คํ–‰ํžˆ๋„, ๋ฌผ๋ฆฌํ•™ ๋ฒ•์น™์ด ์œ ๋งํ•œ ๋Œ€์•ˆ์„ ์ œ์‹œํ–ˆ์Šต๋‹ˆ๋‹ค.
01:28
Imagine hopping on a fast-spinning carousel
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๋น ๋ฅด๊ฒŒ ๋Œ์•„๊ฐ€๋Š” ํšŒ์ „๋ชฉ๋งˆ๋ฅผ ํƒ„ ์‚ฌ๋žŒ์ด
01:31
while holding a rope attached to a rock.
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๋ˆ ๋์— ๋Œ์„ ๋งค๋‹ฌ์•„ ๋“ค๊ณ  ์žˆ๋‹ค๊ณ  ์ƒ์ƒํ•ด๋ณด์„ธ์š”.
01:34
As long as the carousel keeps spinning, the rock and rope will remain horizontal,
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ํšŒ์ „๋ชฉ๋งˆ๊ฐ€ ๋„๋Š” ๋™์•ˆ,
๋Œ๊ณผ ๋ˆ์€ ์›์‹ฌ๋ ฅ์— ์˜ํ•ด ์ˆ˜ํ‰ ์ƒํƒœ๋ฅผ ์œ ์ง€ํ•  ๊ฒ๋‹ˆ๋‹ค.
01:40
kept aloft by centrifugal force.
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01:43
If you're holding the rope, you'll feel this apparent, inertial acceleration
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๋งŒ์•ฝ ์—ฌ๋Ÿฌ๋ถ„์ด ๋ˆ์„ ๋ถ™์žก๊ณ  ์žˆ๋‹ค๋ฉด ๋ถ„๋ช…ํžˆ ๊ด€์„ฑ๋ ฅ์„ ๋Š๋‚„ ์ˆ˜ ์žˆ์„ ๊ฒ๋‹ˆ๋‹ค.
01:48
pulling the rock away from the center of the rotating carousel.
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ํšŒ์ „ํ•˜๋Š” ์ค‘์‹ฌ์˜ ๋ฐ˜๋Œ€ ๋ฐฉํ–ฅ์œผ๋กœ ๋Œ์„ ์žก์•„๋‹น๊ธฐ๋Š” ํž˜์ด์ฃ .
01:53
Now, if we replace the carousel with Earth,
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์ด์ œ ํšŒ์ „๋ชฉ๋งˆ๋ฅผ ์ง€๊ตฌ๋กœ ๋Œ€์ฒดํ•˜๊ณ 
01:56
the rope with a long tether, and the rock with a counterweight,
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๋ˆ์„ ๊ธด ๋ฐง์ค„๋กœ, ๋Œ์„ ๊ท ํ˜•์ถ”๋กœ ๋Œ€์ฒดํ•ด๋ณด์ฃ .
02:00
we have just envisioned the modern space elevatorโ€”
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์ด๋Ÿฌ๋ฉด ํ˜„๋Œ€์‹ ์šฐ์ฃผ ์Šน๊ฐ•๊ธฐ๊ฐ€ ๋ฉ๋‹ˆ๋‹ค.
02:04
a cable pulled into space by the physics of our spinning planet.
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์ž์ „ํ•˜๋Š” ์ง€๊ตฌ์˜ ๋ฌผ๋ฆฌํ•™์— ์˜ํ•ด ์šฐ์ฃผ ๋ฐฉํ–ฅ์œผ๋กœ ๋‹น๊ฒจ์ง€๋Š” ์ค„์ž…๋‹ˆ๋‹ค.
02:10
For this to work, the counterweight would need to be far enough away
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์ด๊ฒŒ ์ž‘๋™ํ•˜๊ธฐ ์œ„ํ•ด์„  ํ‰ํ˜•์ถ”๊ฐ€ ์ถฉ๋ถ„ํžˆ ๋ฉ€๋ฆฌ ๋–จ์–ด์ ธ์žˆ์–ด์„œ
02:14
that the centrifugal force generated by the Earth's spin
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์ง€๊ตฌ์˜ ์ž์ „์— ์˜ํ•ด ์ƒ์„ฑ๋œ ์›์‹ฌ๋ ฅ์ด
02:17
is greater than the planet's gravitational pull.
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์ง€๊ตฌ๊ฐ€ ๋‹น๊ธฐ๋Š” ์ค‘๋ ฅ๋ณด๋‹ค ๊ฐ•ํ•ด์•ผ ํ•ฉ๋‹ˆ๋‹ค.
02:21
These forces balance out at roughly 36,000 kilometers above the surface,
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์ด ํž˜๋“ค์€ ์ง€ํ‘œ๋ฉด์—์„œ ์•ฝ 3๋งŒ6์ฒœkm ๋–จ์–ด์ง„ ๊ณณ์—์„œ ๊ท ํ˜•์„ ์ด๋ฃจ๊ธฐ ๋•Œ๋ฌธ์—,
02:27
so the counterweight should be beyond this height.
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ํ‰ํ˜•์ถ”๋Š” ์ด๋ณด๋‹ค ๋” ๋†’์ด ์žˆ์–ด์•ผ ํ•ฉ๋‹ˆ๋‹ค.
02:30
Objects at this specific distance are in geostationary orbit,
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์ด ํŠน์ • ๋†’์ด์— ์œ„์น˜ํ•˜๋Š” ๋ฌผ์ฒด๋“ค์€ ์ •์ง€ ๊ถค๋„์— ์žˆ๋Š”๋ฐ,
02:35
meaning they revolve around Earth at the same rate the planet spins,
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์ง€๊ตฌ ์ž์ „๊ณผ ๊ฐ™์€ ์†๋„๋กœ ์ง€๊ตฌ๋ฅผ ๊ณต์ „ํ•˜๊ธฐ ๋•Œ๋ฌธ์—,
02:39
thus appearing motionless in the sky.
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ํ•˜๋Š˜์— ์ •์ง€ํ•œ ๊ฒƒ์ฒ˜๋Ÿผ ๋ณด์ž…๋‹ˆ๋‹ค.
02:43
The counterweight itself could be anything,
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๋ฌด์—‡์ด๋“ ์ง€ ํ‰ํ˜•์ถ”๊ฐ€ ๋  ์ˆ˜ ์žˆ๋Š”๋ฐ,
02:45
even a captured asteroid.
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๋Œ์–ด์˜จ ์†Œํ–‰์„ฑ๋„ ๊ฐ€๋Šฅํ•ฉ๋‹ˆ๋‹ค.
02:48
From here, the tether could be released down through the atmosphere
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์ด๊ณณ์—์„œ๋ถ€ํ„ฐ ๋ฐง์ค„์ด ๋Œ€๊ธฐ๊ถŒ์„ ํ†ต๊ณผํ•ด ์•„๋ž˜๋กœ ๋ป—์–ด
02:51
and connected to a base station on the planet's surface.
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์ง€ํ‘œ๋ฉด์— ์žˆ๋Š” ๊ธฐ์ง€์— ์—ฐ๊ฒฐ๋ฉ๋‹ˆ๋‹ค.
02:55
To maximize centrifugal acceleration,
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์›์‹ฌ๋ ฅ์„ ์ตœ๋Œ€ํ•œ ํฌ๊ฒŒ ๋งŒ๋“ค๊ธฐ ์œ„ํ•ด์„œ,
02:58
this anchor point should be close to the Equator.
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๋ถ€์ฐฉ์ ์€ ์ ๋„ ๊ทผ์ฒ˜์— ์žˆ์–ด์•ผ ํ•ฉ๋‹ˆ๋‹ค.
03:01
And by making the loading station a mobile ocean base,
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ํ™”๋ฌผ ์ ์žฌ ์žฅ์†Œ๋ฅผ ์ด๋™ ๊ฐ€๋Šฅํ•œ ๋ฐ”๋‹ค ๊ธฐ์ง€ ํ˜•ํƒœ๋กœ ๋งŒ๋“ค์–ด์„œ
03:05
the entire system could be moved at will,
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์ฒด๊ณ„ ์ „์ฒด๊ฐ€ ์›ํ•˜๋Š” ๋Œ€๋กœ ์›€์ง์ผ ์ˆ˜ ์žˆ์œผ๋ฉฐ,
03:08
allowing it to maneuver around extreme weather,
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๊ทนํ•œ์˜ ๋‚ ์”จ๋ฅผ ํ”ผํ•ด ์›€์ง์ผ ์ˆ˜ ์žˆ๊ณ ,
03:10
and dodge debris and satellites in space.
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์šฐ์ฃผ์—์„œ ์œ„์„ฑ์ด๋‚˜ ํŒŒํŽธ๋„ ํ”ผํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
03:14
Once established, cargo could be loaded onto devices called climbers,
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์„ค์น˜๊ฐ€ ์™„๋ฃŒ๋˜๋ฉด ํ™”๋ฌผ์„ ์Šน๊ฐ•๊ธฐ์— ์‹ฃ๊ณ 
03:19
which would pull packages along the cable and into orbit.
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์Šน๊ฐ•๊ธฐ๋Š” ์ค„์„ ๋”ฐ๋ผ ์›€์ง์—ฌ์„œ ํ™”๋ฌผ์„ ๊ถค๋„๋กœ ์˜ฎ๊น๋‹ˆ๋‹ค.
03:23
These mechanisms would require huge amounts of electricity,
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์ด๋Ÿฐ ์žฅ์น˜๋Š” ์ „๊ธฐ๊ฐ€ ๋ฌด์ฒ™ ๋งŽ์ด ํ•„์š”ํ•œ๋ฐ
03:27
which could be provided by solar panels or potentially even nuclear systems.
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ํƒœ์–‘๊ด‘ ๋ฐœ์ „ํŒ์„ ํ†ตํ•ด ๊ณต๊ธ‰ํ•˜๊ฑฐ๋‚˜, ์›์ž๋ ฅ ๋ฐœ์ „๋„ ์ด์šฉํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
03:32
Current designs estimate that it would take about 8 days
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ํ˜„์žฌ ์„ค๊ณ„๋Œ€๋กœ๋ผ๋ฉด ์•ฝ 8์ผ ์ •๋„๋ฉด
03:35
to elevate an object into geostationary orbit.
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์ •์ง€ ๊ถค๋„๊นŒ์ง€ ํ™”๋ฌผ์„ ์˜ฌ๋ ค๋ณด๋‚ผ ๊ฒƒ์œผ๋กœ ์˜ˆ์ƒํ•ฉ๋‹ˆ๋‹ค.
03:39
And with proper radiation shielding,
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์ ์ ˆํ•œ ๋ฐฉ์‚ฌ๋Šฅ ์ฐจํ๋ง‰์ด ์žˆ๋‹ค๋ฉด,
03:41
humans could theoretically take the ride too.
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์ด๋ก ์ ์œผ๋ก  ์‚ฌ๋žŒ๋„ ํƒˆ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
03:44
So, what's stopping us from building this massive structure?
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๊ทธ๋Ÿฌ๋ฉด ์ด๋Ÿฐ ๊ฑฐ๋Œ€ํ•œ ๊ตฌ์กฐ๋ฅผ ์ง€๊ธˆ ๋งŒ๋“ค์ง€ ๋ชปํ•˜๋Š” ์ด์œ ๋Š” ๋ฌด์—‡์ผ๊นŒ์š”?
03:47
For one thing, a construction accident could be catastrophic.
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ํ•œ ๊ฐ€์ง€๋Š” ๊ฑด์„ค ์ค‘ ์‚ฌ๊ณ ๊ฐ€ ๋ฐœ์ƒํ•˜๋ฉด ๋Œ€์žฌ๋‚œ์ด ๋œ๋‹ค๋Š” ์ ์ž…๋‹ˆ๋‹ค.
03:51
But the main problem lies in the cable itself.
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ํ•˜์ง€๋งŒ ๊ฐ€์žฅ ํฐ ๋ฌธ์ œ๋Š” ์ค„์ž…๋‹ˆ๋‹ค.
03:55
In addition to supporting a massive amount of weight,
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์–ด๋งˆ์–ด๋งˆํ•œ ๋ฌด๊ฒŒ๋ฅผ ์ง€ํƒฑํ•˜๋Š” ์™ธ์—๋„
03:58
the cable's material would have to be strong enough
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์ค„์„ ๊ตฌ์„ฑํ•˜๋Š” ์žฌ๋ฃŒ๊ฐ€
ํ‰ํ˜•์ถ”๊ฐ€ ๋‹น๊ธฐ๋Š” ํž˜์„ ๊ฒฌ๋”œ ๋งŒํผ ๊ฐ•ํ•ด์•ผ ํ•ฉ๋‹ˆ๋‹ค.
04:01
to withstand the counterweight's pull.
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04:03
And because this tension and the force of gravity would vary at different points,
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ํŠนํžˆ ์žฅ๋ ฅ๊ณผ ์ค‘๋ ฅ์ด ๊ณณ์— ๋”ฐ๋ผ ๋‹ค๋ฅด๊ธฐ ๋•Œ๋ฌธ์—
04:08
its strength and thickness would need to vary as well.
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๊ฐ•๋„์™€ ๋‘๊ป˜๋„ ๊ทธ์— ๋งž์ถฐ์•ผ ํ•ฉ๋‹ˆ๋‹ค.
04:13
Engineered materials like carbon nanotubes and diamond nano-threads
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ํƒ„์†Œ๋‚˜๋…ธํŠœ๋ธŒ๋‚˜ ๋‹ค์ด์•„๋ชฌ๋“œ๋‚˜๋…ธ์Šค๋ ˆ๋“œ ๊ฐ™์€ ๊ณตํ•™์  ์žฌ๋ฃŒ๋“ค์ด
04:18
seem like our best hope for producing materials
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๋ชฉ์ ์— ์•Œ๋งž์€ ๊ฐ€๋ณ๊ณ  ํŠผํŠผํ•œ ์ค„์„ ๋งŒ๋“œ๋Š” ์ตœ๊ณ ์˜ ์žฌ๋ฃŒ๋กœ ๋ณด์ž…๋‹ˆ๋‹ค.
04:21
strong and light enough for the job.
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04:24
But so far,
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๋‹ค๋งŒ ์•„์ง๊นŒ์ง€๋Š” ์•„์ฃผ ์ž‘์€ ๋‚˜๋…ธํŠœ๋ธŒ ์‚ฌ์Šฌ๋งŒ ๋งŒ๋“ค ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
04:25
we've only been able to manufacture very small nanotube chains.
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04:29
Another option would be to build one somewhere with weaker gravity.
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๋Œ€์•ˆ์œผ๋กœ๋Š” ์ค‘๋ ฅ์ด ๋” ์ž‘์€ ํ–‰์„ฑ์— ๊ตฌ์กฐ๋ฌผ์„ ๊ฑด์„คํ•˜๋Š” ๊ฒ๋‹ˆ๋‹ค.
04:34
Space elevators based on Mars or the Moon
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์šฐ์ฃผ ์Šน๊ฐ•๊ธฐ๋ฅผ ํ™”์„ฑ์ด๋‚˜ ๋‹ฌ์— ๊ฑด์„คํ•˜๋ฉด
04:36
are already possible with existing materials.
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์ง€๊ธˆ ์žˆ๋Š” ์žฌ๋ฃŒ๋กœ๋„ ๊ฐ€๋Šฅํ•ฉ๋‹ˆ๋‹ค.
04:39
But the huge economic advantage of owning an Earth-based space elevator
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ํ•˜์ง€๋งŒ ์ง€๊ตฌ์— ์šฐ์ฃผ ์Šน๊ฐ•๊ธฐ๋ฅผ ๊ฑด์„คํ•  ๋•Œ ์ƒ๊ธฐ๋Š” ๋ง‰๋Œ€ํ•œ ๊ฒฝ์ œ์  ์ด๋“ ๋•Œ๋ฌธ์—
04:44
has inspired numerous countries to try and crack this conundrum.
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์ˆ˜๋งŽ์€ ๋‚˜๋ผ๋“ค์ด ์ด ๋‚œ์ œ๋ฅผ ํ•ด๊ฒฐํ•˜๋ ค๊ณ  ๋…ธ๋ ฅ ์ค‘์ž…๋‹ˆ๋‹ค.
04:49
In fact, some companies in China and Japan
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์‚ฌ์‹ค, ์ค‘๊ตญ์ด๋‚˜ ์ผ๋ณธ์˜ ์ผ๋ถ€ ํšŒ์‚ฌ๋“ค์€
04:52
are already planning to complete construction by 2050.
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2050๋…„ ์™„๊ณต์„ ๋ชฉํ‘œ๋กœ ์ด๋ฏธ ๊ณ„ํš์„ ์„ธ์› ์Šต๋‹ˆ๋‹ค.
์ด ์›น์‚ฌ์ดํŠธ ์ •๋ณด

์ด ์‚ฌ์ดํŠธ๋Š” ์˜์–ด ํ•™์Šต์— ์œ ์šฉํ•œ YouTube ๋™์˜์ƒ์„ ์†Œ๊ฐœํ•ฉ๋‹ˆ๋‹ค. ์ „ ์„ธ๊ณ„ ์ตœ๊ณ ์˜ ์„ ์ƒ๋‹˜๋“ค์ด ๊ฐ€๋ฅด์น˜๋Š” ์˜์–ด ์ˆ˜์—…์„ ๋ณด๊ฒŒ ๋  ๊ฒƒ์ž…๋‹ˆ๋‹ค. ๊ฐ ๋™์˜์ƒ ํŽ˜์ด์ง€์— ํ‘œ์‹œ๋˜๋Š” ์˜์–ด ์ž๋ง‰์„ ๋”๋ธ” ํด๋ฆญํ•˜๋ฉด ๊ทธ๊ณณ์—์„œ ๋™์˜์ƒ์ด ์žฌ์ƒ๋ฉ๋‹ˆ๋‹ค. ๋น„๋””์˜ค ์žฌ์ƒ์— ๋งž์ถฐ ์ž๋ง‰์ด ์Šคํฌ๋กค๋ฉ๋‹ˆ๋‹ค. ์˜๊ฒฌ์ด๋‚˜ ์š”์ฒญ์ด ์žˆ๋Š” ๊ฒฝ์šฐ ์ด ๋ฌธ์˜ ์–‘์‹์„ ์‚ฌ์šฉํ•˜์—ฌ ๋ฌธ์˜ํ•˜์‹ญ์‹œ์˜ค.

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