/sci/ - Science & Math » Thread #9525122

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Hey /sci/ are space elevators possible?

Anonymous Sun 18 Feb 05:32:32 2018 No.9525122 View Reply Original Report

Quoted By: >>9525129 >>9525133 >>9525887 >>9527376 >>9527387

Is Elon Musk right when he says space elevators are impractical?

Anonymous

Anonymous Sun 18 Feb 2018 05:36:25 No.9525129 Report

Quoted By: >>9525284

>>9525122
Hes right, for now.

Anonymous

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Anonymous Sun 18 Feb 2018 05:39:16 No.9525133 Report

Quoted By: >>9525284 >>9528446

>>9525122
Not on Earth, no. On other planets with less gravity it is a possibility.

Anonymous

Anonymous Sun 18 Feb 2018 07:20:31 No.9525284 Report

Quoted By: >>9525288 >>9525460 >>9525816 >>9526038

>>9525129
What are the constraints?
>>9525133
What is the best bet? Reusable Rockets? Space planes? Mass Drivers?

Anonymous

Anonymous Sun 18 Feb 2018 07:23:38 No.9525288 Report

Quoted By: >>9525301 >>9525618 >>9525816

>>9525284
tensile strength of the tether is one limiting factor. on the moon you could make a space elevator with a kevlar tether, here on earth you'd need something with "nano" in the name

Anonymous

Anonymous Sun 18 Feb 2018 07:36:16 No.9525301 Report

Quoted By:

>>9525288
Checked.
Do you think we missed window of opportunity for exploration by both abandoning Apollo and rejecting SDI

Anonymous

Anonymous Sun 18 Feb 2018 09:23:13 No.9525426 Report

Quoted By:

bump

Anonymous

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Anonymous Sun 18 Feb 2018 09:41:53 No.9525444 Report

Quoted By: >>9525493 >>9525651

>you know space elevators counter the interests of BIG ROCKET

Anonymous

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Anonymous Sun 18 Feb 2018 10:04:30 No.9525460 Report

Quoted By:

>>9525284
My personal favorite.

Anonymous

Anonymous Sun 18 Feb 2018 10:39:45 No.9525488 Report

Quoted By:

Expensive, difficult, and limited. Sort of counterproductive if you want cheap and easy access to space. Space elevators are essentially scifi wank like the floating castles in fantasy but close enough to the average person's life experience to seem realistic and futuresque.
Guns and rockets are boring 50's stuff no way are we gonna use those in the future.

Anonymous

Anonymous Sun 18 Feb 2018 10:49:08 No.9525493 Report

Quoted By:

>>9525444
I don't like this meme format. It just looks like she's unimpressed with the first one and doubtful about the second one. It's like a shitty version of that Drake meme.

Anonymous

Anonymous Sun 18 Feb 2018 12:55:23 No.9525618 Report

Quoted By: >>9527780 >>9528390 >>9528448 >>9528509

>>9525288
A Lunar elevator is impossible.
The moon rotates 28 times slower. So the centrifugal force which keeps the cable taut is 784 times weaker. There's less gravity on the moon, but not 784 times less! The line would have to extend far, far past the Earth.

A Martian elevator could be built with current materials. Have to move Phobos and Deimos out of the way though -- or raise one into position to serve as the counterweight.

Anonymous

Anonymous Sun 18 Feb 2018 13:15:54 No.9525651 Report

Quoted By: >>9525670 >>9528523

>>9525444
>tfw you had a highschool physics teacher for a year who used an earth gravity of 10 for calculations

Anonymous

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Anonymous Sun 18 Feb 2018 13:17:58 No.9525654 Report

Quoted By:

>i lik speec elaveter becos nanotubs

Anonymous

Anonymous Sun 18 Feb 2018 13:32:07 No.9525670 Report

Quoted By:

>>9525651
But that's right.
Acceleration at the Earth's surface is 0.982 Standard Gravities.
(Give or take, depending on location.)

Anonymous

Anonymous Sun 18 Feb 2018 15:00:28 No.9525755 Report

Quoted By:

The space fountain is far superior

Anonymous

Anonymous Sun 18 Feb 2018 15:41:08 No.9525816 Report

Quoted By:

>>9525288
On Earth you need something with "magic" in the name.

>>9525284
Rockets are the best technology that will ever be developed. This is due to the fact that fuel can be manufactured via biomass (biomethane) and because they are the most efficient means physically possible.

Anonymous

Anonymous Sun 18 Feb 2018 16:26:15 No.9525887 Report

Quoted By: >>9526530

>>9525122
Isaac got your covered

https://www.youtube.com/watch?v=dc8_AuzeYKE

Anonymous

Anonymous Sun 18 Feb 2018 17:32:59 No.9526038 Report

Quoted By:

>>9525284
>What is the best bet? Reusable Rockets? Space planes? Mass Drivers?

>Reusable Rockets
Good for transporting cargo into orbit.

>Space planes
Good for public/private transportation into LEO

>Mass Drivers
Good for weapons and launching cargo and low-gravity colonies.

Anonymous

Anonymous Sun 18 Feb 2018 17:36:56 No.9526048 Report

Quoted By: >>9526499 >>9527369

Forget space elevators and sign up for my space rollercoaster theory.
Basically take a pipe, about 50 km in length and turn it into a railgun pointing at the sky. Not instantly horizontally but with a gradual curvature. Lead it up Mount Everest and shoot cargo into orbit.
Please rate.

Anonymous

Anonymous Sun 18 Feb 2018 21:26:04 No.9526499 Report

Quoted By: >>9527346 >>9527369

>>9526048
Reaching 11 km/sec in 50 km means 121 gees of acceleration.
Plus the centrifugal force during that curve up the side of Mt Everest.
Plus air resistance as you emerge from the tube.

Thank you, but "no".

Anonymous

Anonymous Sun 18 Feb 2018 21:34:16 No.9526530 Report

Quoted By: >>9526602

>>9525887
That accent is pretty cool

Anonymous

Anonymous Sun 18 Feb 2018 22:09:49 No.9526602 Report

Quoted By: >>9526623 >>9528486

>>9526530
It's actually rhotacism, issue with pronouncing the letter R. Not nearly as present in his newer videos as it was in his older ones though.

Anonymous

Anonymous Sun 18 Feb 2018 22:20:30 No.9526623 Report

Quoted By:

>>9526602
it's actually whotacism issue with pwonouncing the lettew aww. Not Neawly as Pwesent in his newew videos as it was in his oldew ones though

Anonymous

Anonymous Mon 19 Feb 2018 04:34:59 No.9527346 Report

Quoted By: >>9527369

>>9526499
Wrong, you are not calculating an insertion into orbit from the tibetan plateau, but an assisted launch, for starting anyway.

Make it a 200km long vacuum railgun that shoots Eastward- ESE. Use solid rocket booster assists if necessary. Much cheaper long term (hundreds of launches) compared to normal rockets form sea level.

It would probably be better to build one in Papua New Guinea or Kilimanjaro.

Anonymous

Anonymous Mon 19 Feb 2018 04:51:54 No.9527369 Report

Quoted By: >>9527372

>>9526048
>>9526499
>>9527346
"Vertical maglev rocket launch system, China

Published on Sep 8, 2016

Proposal for Chinese maglev rocket launch system, from the Himalayan Mountains. "

https: //issuu.com/jeremybatterson/docs/roofofworldpdf

Anonymous

Anonymous Mon 19 Feb 2018 04:53:02 No.9527372 Report

Quoted By:

>>9527369
It is also a plot device in "the moon is a harsh mistress" by the immortal Heinlein.

Anonymous

Anonymous Mon 19 Feb 2018 04:55:33 No.9527376 Report

Quoted By:

>>9525122
Launch loops and orbital rings have all the benefits of space elevators but are possible with modern materials.

Anonymous

Anonymous Mon 19 Feb 2018 05:02:23 No.9527387 Report

Quoted By: >>9527548 >>9527563 >>9527566

>>9525122
> Hey /sci/ are space elevators possible?
Short answer: No.

Long answer: There are no material avaliable on earth that can withstand the stresses & forces in such structure.

Graphene was theoretically proposed building material, since it's super strong, but we don't know how to manufacture it in big sizes.
However even graphene may not be strong enough.

There are no other known building materials stronger than graphene (which still too weak to be used)

Anonymous

Anonymous Mon 19 Feb 2018 07:02:12 No.9527548 Report

Quoted By: >>9527563 >>9527983 >>9528487 >>9528500

>>9527387
>Long answer: There are no material avaliable on earth that can withstand the stresses & forces in such structure.
on earth...
but on the moon a space elevator is perfectly feasible with the materials we have today, maybe on mars too

Anonymous

Anonymous Mon 19 Feb 2018 07:10:34 No.9527563 Report

Quoted By: >>9528487 >>9528500

>>9527548
>>9527387
This, on earth you would a single strand of graphine would just barely be enough to make a space elevator. While you could make one on the moon out of steel.

Anonymous

Anonymous Mon 19 Feb 2018 07:12:41 No.9527566 Report

Quoted By: >>9527769

>>9527387
no there was a new variaton of graphene that could be strong enough to tether mars to jupiter or something like that

Anonymous

Anonymous Mon 19 Feb 2018 09:43:29 No.9527769 Report

Quoted By:

>>9527566
Source?

Anonymous

Anonymous Mon 19 Feb 2018 09:56:52 No.9527780 Report

Quoted By: >>9528509

>>9525618
The moon is in tidal lock. You could put the cable on the other side of the moon and it wouldn’t go near the Earth.

Anonymous

Anonymous Mon 19 Feb 2018 12:44:37 No.9527983 Report

Quoted By:

>>9527548
Why would you want to build huge slow ass space elevator on the moon instead of the considerably more useful mass drivers? That's ridiculous.

Anonymous

Anonymous Mon 19 Feb 2018 16:50:40 No.9528390 Report

Quoted By:

>>9525618
>A Lunar elevator is impossible
Not according to wikipedia.
https://en.wikipedia.org/wiki/Space_elevator#Extraterrestrial_elevators

Anonymous

Anonymous Mon 19 Feb 2018 17:07:20 No.9528446 Report

Quoted By:

>>9525133
I'll have a drumstick!

Anonymous

Anonymous Mon 19 Feb 2018 17:08:31 No.9528448 Report

Quoted By:

>>9525618
What is "bigger counterweight?"

Anonymous

Anonymous Mon 19 Feb 2018 17:14:03 No.9528458 Report

Quoted By:

Carbon tubes and the issue raised by one atom being out of place.

https://www.newscientist.com/article/2093356-carbon-nanotubes-too-weak-to-get-a-space-elevator-off-the-ground/

Anonymous

Anonymous Mon 19 Feb 2018 17:17:54 No.9528471 Report

Quoted By: >>9528630

Forget everything else and focus on alcubierre drive
find out how to produce and store anti matter and negative energy

Anonymous

Anonymous Mon 19 Feb 2018 17:22:41 No.9528486 Report

Quoted By:

>>9526602
"oawth"

Anonymous

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Anonymous Mon 19 Feb 2018 17:22:47 No.9528487 Report

Quoted By:

>>9527548 >>9527563
>but on the moon a space elevator is perfectly feasible
Nice idea. Let's make it on moon.

Anonymous

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Anonymous Mon 19 Feb 2018 17:26:39 No.9528500 Report

Quoted By:

>>9527548 >>9527563
>but on the moon a space elevator is perfectly feasible
Nice idea. Let's make it on moon. .

Anonymous

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Anonymous Mon 19 Feb 2018 17:29:13 No.9528509 Report

Quoted By:

>>9527780
>>>9525618
>The moon is in tidal lock. You could put the cable on the other side of the moon and it wouldn’t go near the Earth.

The moon is in tidal lock.

"Makes you think" intensifies

Anonymous

Anonymous Mon 19 Feb 2018 17:34:01 No.9528523 Report

Quoted By:

>>9525651
for high school that's good enough

Anonymous

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Anonymous Mon 19 Feb 2018 18:14:10 No.9528630 Report

Quoted By:

Any word on the viability of Lofstrom Loops? plz

>>9528471
These things would be much safer and better to produce in space, where there's solar energy to spare.

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