Space Elevator

by nivethan • 3 years ago

1456 203 3 years ago

davidhyde• 3 years ago

At 74km/h you would reach space (100km karman line) in an hour and a half but you would need to keep going for another 20 days at that speed reach geostationary orbit in order to not fall back to earth when you exit the space elevator.

philwelch3• 3 years ago

Yeah, I wish this went on as far as an actual space elevator would, perhaps with extra visualizations of the heights of various orbits. The top would be slightly above geostationary orbit, since you would need the center of mass to be at the geostationary point in order to work.

Sharlin6• 3 years ago

Or more than slightly if you don't want to haul up a big counterweight but just use the cable itself as a counterweight. The Brad Edwards design proposes a total cable length of around 100,000 km. One very nice side effect of a long cable is that you can slingshot spacecraft from the far end up to ~Jupiter's orbit with zero propellant needed.

LeanderK• 3 years ago

but do you need to reach geostationary? couldn't you just switch to a rocket at this stage? Maybe a small one to bridge the gap? I would have thought that the first kilometres are the ones where you have to invest the most work so if you just bridge them using the space elevator it would be still an improvement.

Maybe for cargo the 20 days are not really important

midasuni6• 3 years ago

Getting to 100km or even 200km is easy. Staying there is hard.

80% of the energy in a rocket goes to adding sideways motion.

An elevator upto GEO adds enough energy (taken from the earths rotational energy) to your payload to get it into orbit. If you let go lower down you need to add sideways velocity.

In LEO you on an elevator would be travelling about 1,400mph and need to get to 18,000 to get into orbit. Sure there’s no atmosphere to work against but it’s still a lot of fuel to use in a rocket.

nivenkos• 3 years ago

At that point gravity will act slower though, so it might be enough to take up a small liquid fuel craft too.

Rockets will have abandoned solid fuel boosters long before then.

drtgh2• 3 years ago

If you take a lift to a distance of 100 km and drop it, it will fall immediately reaching the ground in less than 10 minutes. Gravity remains strong.

Satellites and space stations are always in free fall. The thing that keeps them in "space" is the velocity with which they were originally launched to orbit the Earth as centripetal force becomes the weight of the satellite, which slows down such falling process. Seeing it with cold eyes, they employ all the energy at a first for to lift the weight of that falling object.

If a geostationary satellite has to stay over the same region of the planet, it has to be sent much much far away, until its orbital velocity become synchronized with the Earth's rotation. And even like that, keeps being in free fall due Earth's gravity.

I mean, what we see in cartoons or sci-movies about to send a rocket absolutely vertical and cut engines, or a spaceship joining over a planet and conserve the same orbital position, could be done only with anti-gravitational engines. A small liquid fuel could not maintain them in place.

NoMoreNicksLeft• 3 years ago

Can the speed be safely increased once you leave the atmosphere and there is no (appreciable) drag? With such a system in place, are there no other interesting places to stop along the way to geosync?

midoridensha4• 3 years ago

The other problem people seem to forget is radiation. The Van Allen belts expose people to a lot of radiation; normally it's not a problem, because either people stay under the belts (as in stations like the ISS which are at LEO), or for the few times humans went beyond LEO, to the Moon, they blasted through the belts very quickly and thus had negligible cumulative radiation exposure. But if you're sitting on a space elevator taking days to go through the VA belts, you'll probably get a fatal dose.

Wikipedia has an article that touches on this here: https://en.wikipedia.org/wiki/Space_elevator_safety

rasengan• 3 years ago

I love this. Space elevators are going to be here much sooner than it seems with carbon nanotube tech. :)

mcv4• 3 years ago

Would be cool, but as far as I understand, even long, continuous carbon nanotubes wouldn't be strong enough to carry their own weight.

Sharlin6• 3 years ago

Not if the cable has constant cross-sectional area, but actual designs call for a cable with an exponential taper, and that would make a carbon nanotube cable feasible. With currently available engineering materials the taper ratio would be too large (~10^8 for Kevlar, ~10^33 for steel…)

bluber84• 3 years ago

And I thought the cable had to be made of spider silk hadn’t?

Sharlin6• 3 years ago

There's not been that much progress in the 20 years since Brad Edwards proposed the first actually feasible space elevator design. It's difficult to say whether ultra-strong CNT cables are something that's perpetually 20 years away, or something that follows the "progress is slow until it suddenly isn't slow" exponential curve.

amelius• 3 years ago

Too bad someone will write an article titled "Will we get space elevators sooner than we think?" and Betteridge's law will prevent it from happening.

buffington• 3 years ago

Simply beautiful.

avmich4• 3 years ago

I don't understand why so many seemingly educated people keep discussing Earth space elevator. For a long time there is a conclusion that the elevator is incompatible with Earth satellites, which mostly fly below GEO, and elevator will collide with satellites, with all negative consequences. The inherent elevator problem has nothing to do with the material of the cable.

Am I missing something?

JPLeRouzic• 3 years ago

Maybe because it's an old idea, from a time when non-GEO satellites were rare?

(when I was a kid in the 60s/70s, the cool thing was geostationary satellites)

avmich4• 3 years ago

GEO is harder to achieve than LEO. There was never time when non-GEO satellites didn't outnumber GEO ones.

Gunax• 3 years ago

It's an idea that straddles science fiction and reality, but is simple enough for normal people to understand and have an opinion about.

unwind• 3 years ago

To me, a long-time sci-fi reader but hardly a hardcore space nut, your argument reads a little like "I don't understand why people are discussing horseless carriages, I mean what would the street sweepers do without all the manure to clean up?".

In other words, a functioning space elevator would be grand, epic and useful in ways that make the potential loss of some satellite orbits look like a very minor detail. At least that's my take. Too bad about the materials science not doing its part, huh. :)

avmich4• 3 years ago

No, a better comparison would be "why people discuss antigravity sleds". Space elevator could have uses, if it wouldn't conflict with reality about as much as antigravity sleds, levitating a meter above the road, are.

Horseless carriages in this comparison are rockets.

apendleton• 3 years ago

I think the space-elevator concept is sort of silly, but this doesn't seem like the most pertinent criticism to me. Presumably in a hypothetical future in which a space elevator is under serious consideration, vastly greater resources are being devoted to space technology, launch costs are much less than now, and are about to get cheaper still due to the elevator in question. It seems like if we were on the cusp of being able to 100x the number of satellites or whatever, sacrificing the existing fleet for new ones in different orbits that avoided the elevator wouldn't be too big a sacrifice.

sebzim4500• 3 years ago

As satellite density increases every satellite will need a collision avoidance system anyway. And getting from geo to leo is way less difficult than launching to leo from the ground.

avmich4• 3 years ago

It's not clear. Maybe satellites will be assigned flypaths, like in aviation? Or you can have either a short-lived satellite, a GEO sat, a well-maintained constellation for communications or observations, singular exceptions like Hubble - or go fly away from Earth? Or something else? Not sure it's good idea for space elevator engineers to trust as much that all satellites will always behave as they, space elevator engineers, absolutely require. The error cost is pretty high.

MilStdJunkie2• 3 years ago

Space is big. 1) The cable's vibration resonance can be adjusted to avoid the bulk of larger objects, 2) new satellites can be mandated to have emergency maneuver systems (with larger objects not yet de-orbited cleared out by an elevator consortium), and 3) the cable will necessarily have close range defense systems probably at intervals for smaller objects that might be harder to detect at long range. The cable, also, is enormous, which is the largest barrier to its implementation - it would dwarf every other artifact in human history, put together - and can not be made with any material we can currently create at scale. Compared with that, orbital TCAS of some sort is fairly trivial. In the long term, a space elevator is inevitable, but it's inevitable in the same way that . . I dunno, human-crocodile hybrids are, or fusion drive, or the way a lot of other medium-term future stuff is.

EDIT Also, this thing stops at the Karman line. That's not a viable space elevator. Pretty widget, though.

marcosdumay3• 3 years ago

In the long term, a space elevator is inevitable

There are plenty of zero-fuel launch possibilities and a few very high-ISP ones. On the long term one of them is inevitable, but it's pushing it a bit to claim that it will be the space elevator.

mLuby• 3 years ago

1) It's the only static non-rocket launch system. As such it doesn't require people to buy into the "active support structure" concept which is a prerequisite for orbital rings (<3), launch loops, or space fountains. (Rotovators, though arguably static, require exotic setups for terrestrial use.)

2) It's been around long enough to have made it into mainstream culture, especially via big-budget Hollywood movies.

3) The name is straightforward and approachable to laypeople. An elevator to space nicely obscures issues like its mind-boggling size, duration of transit, and even "reach space" vs "achieve orbit."

4) Picturing the structure fixed over a point on Earth seemingly sidesteps sovereign territory issues and international cooperation, further simplifying the conversation.

The Space Elevator is a gateway to megastructures more than a gateway to space.

burnished• 3 years ago

Cause they are fucking rad! Its grandiose and big but plausible, its like some one heard of archimedes lever and took it as a challenge. Basically it sparks the imagination :)

Is that sort of collision inevitable or can you have parallel orbits that don't collide? I'm ignorant and this is the first I'm hearing of this issue. Last I heard the material science part was the heartbreaker.

paxys• 3 years ago

Amazing visualization. The most interesting part to me is the weird fluctuation in temperature. You'd think it would trend in a single direction. What causes all the frequent ups and downs?

wonrax• 3 years ago

At 17446m mark:

Unlike the troposphere, the temperature in the stratosphere increases the higher you go.

mkl• 3 years ago

There's a graph here: https://pressbooks.bccampus.ca/physgeoglabmanual1/chapter/la...

jameshart• 3 years ago

Right, but that's an 'effect', not a 'cause'.

alana314• 3 years ago

Wow, this is charming!

gibolt• 3 years ago

A key point with space elevators is that they aren't limited to Earth. The solar system has plenty of celestial bodies that could benefit (us) from having one.

It may not be as significant as the impact of an Earth-based one, but any propellant savings is a win.

philwelch3• 3 years ago

Some of those celestial bodies are even small enough that we could build the elevators with existing materials, too.

mcv4• 3 years ago

A space elevator on Mars is probably totally feasible. But of course the benefits would be much larger on Earth.

The problem is: the benefit of a space elevator is bigger the deeper your gravity well is, but it's also much harder to impossible to make one there.

But I've also been wondering: wouldn't it be possible to have a tapering space elevator? Reduce the weight by making the parts that have to carry less weight thinner?

markonen• 3 years ago

The Moon being a great example.

lastangryman• 3 years ago

A martian space elevator is explored in Kim Stanley Robinson's Red Mars trilogy, definitely worth a read.

ronyfadel• 3 years ago

I’m impressed with how high planes and rockets built almost 100 years ago got.

mcv4• 3 years ago

I thought it would go all the way up to the anchor of the space elevator, so I expected to have to scroll up for another couple of hours. I guess the creator wisely decided that was a bit too much.

Amazing how high the F-104 Starfighter could fly, by the way.

brettermeier• 3 years ago

I wonder about the skydiver at almost 3000 m altitude. Isn't 4000 m a typical jump height?

Edit: Okay, depends on where you live and learn.

Moissanite• 3 years ago

FYI, this crashed my browser with extreme prejudice; I can't remember one other time when I've had to force-stop the application. (Firefox on Android)

hammyhavoc7• 3 years ago

Sounds like another good reason to move on from Mozilla.

Anduia2• 3 years ago

Or perhaps a reason to update Windows https://news.ycombinator.com/item?id=35511713

globular-toast2• 3 years ago

That would require a reasonable alternative.

jonas-w• 3 years ago

Using firefox on android and it worked perfectly fine.

cambaceres• 3 years ago

What is a pigeon doing at 2000 meters altitude?

hammyhavoc7• 3 years ago

What is a human being doing at that altitude? Flying.

Etherlord87• 3 years ago

S..itting on people below.

hanselot• 3 years ago

I love this. Reminds me of a thread I perused once re Orbital Ring Space elevator concept, and how it seems not only possible, but almost disgustingly cheap (in terms of the gains) with current technology. Not only would such an endeavor restore some aspect of pride to humanity, but the benefits are quite numerous.

To name a few low-hanging fruit:

The research done to make it possible, would definitely advance several fields.

The ability to access photons from outside of the atmosphere should vastly improve how much energy we could capture from the sun. Pair this with transparent solar tech designed to pass through the wavelengths that are useful to plants, and we can factory farm crops in space using fully automated systems. This could also lead to exploration of engineered crops that can withstand (and potentially absorb radiation), that may serve as a biological wall for the humans.

Obviously, it would be a given that asteroid mining would become vastly more simplified, and autonomous robotic space construction and perhaps even asteroid mining would become a fantastic way to profit from it (or/and dilute the value of existing rare earth minerals/metals).

Obviously, this would also make intra-solar travel orders of magnitudes cheaper.

Maintaining and cleaning up space debris would become substantially simpler.

Building planetary defense mechanisms (against extinction level events) would become more feasible if we have this in place.

There are obviously an enormous number of things that could go wrong with a project like this, but given a CERN or Manhattan Project level of funding and cooperation, I think we could build this in a couple decades.

This is the kind of future I would want to be a part of. The cost estimate I think was somewhere in the trillions, but even so, the potential benefits are so vast that it just doesn't make sense not to do it, right?

In case you don't want to google the wiki page: https://en.wikipedia.org/wiki/Orbital_ring

Don't even take my word for it. Go question ChatGPT about it.

hammyhavoc7• 3 years ago

And so what about the downsides? The ultimate target for terrorists. If that comes down and it wraps itself around the Earth, it'll be devastating.

falcor84• 3 years ago

My understanding is that it would be under tension and orbiting at beyond escape velocity, such that if it got cut off, it would fly away from Earth. Still bad, but not catastrophically. Maybe we could even recover it.

Balero• 3 years ago

The structure wouldn't be able to passively stay together. If it was to be destroyed then it would burn up in the atmosphere like anything else. It is not made of a magic non-existent material that is infinitely strong. Of course if you had a massive dense asteroid attached that would not, so it makes sense to be careful with what is around it. But the orbital ring itself would break up and be no more dangerous than a bunch of satellites of similar mass.

Also it would not be an "Ultimate target" for "terrorists". Terrorists are violent political activists, not super villains that want to destroy the world. I doubt, for example, that the new-IRA would get a united Ireland by destroying orbital infrastructure.

thechao• 3 years ago

The original paper for the ORS was engineered out of COTS from materials in the early 80s, designed to be built on a UK-friendly budget renting space from the US Space Shuttle program. With Space-X-like tech, it'd be hilariously cheap: especially with the new superconducting tape which didn't exist 40 years ago.

Here's the thing with an ORS: why have one 350km-high ORS, when you can build a stack of ~60 of them out to geosynch? Such a stack is an ORS-Jacob's-ladder, and is a compromise between a full Clarke-style space-elevator and reality.

limbicsystem• 3 years ago

Never mind space elevators - we could build useful sky hooks right now (and Mars might be the best place to do it...) https://youtu.be/dqwpQarrDwk

have_faith• 3 years ago

Temperatures in the thermosphere can reach 2,500°C, but molecules are so far apart that you wouldn't even feel it.

How do the molecules reach that temperature?

exitb• 3 years ago

They absorb solar radiation. It can't be stressed enough though, that people understand temperatures in terms of the ability to transfer heat and store energy. Due to the extremely low pressure, both of these are actually very, very low.

jimmySixDOF• 3 years ago

Slightly tangential, slightly more achievable (?) , but I was just listening to a BBC Worldservice Radio Podcast on Space based Solar farms that would beam concentrated energy back down to earth [1]. By no means a new idea but they wrap up current thinking in 30min.

[1] https://www.bbc.co.uk/sounds/play/w3ct5bjt

adlpz• 3 years ago

That was absolutely fantastic. I just left a pretty rough meeting and came to HN for some healthy procrastination.

Really made my day.

debesyla• 3 years ago

Congratulations! You have made it 0.01% to the moon.

Okay, haha, now that gives a nice perspective how far is the Moon.

virtualritz• 3 years ago

This is great.

I just wish there was one way to switch all units. The temp. can be switched between F/C by tapping on it.

The height is metric and seems fixed and then stuff in text bubbles is again imperial (e.g. mph instead of kph).

once_inc• 3 years ago

That is mostly because the international space community works with metric, so the Karman line is at 100km above earth, and converting to imperial units would be forced.

Remember, there are only three countries that use imperial units; two third-world counties, and a global superpower.

marstall• 3 years ago

it just detracts a bit from the "wow so high! 10 miles! factor" for the luddites among us

JoBrad• 3 years ago

That’s not entirely true. The UK and Australia use Imperial measurements quite frequently, especially for speed.

midoridensha4• 3 years ago

The US doesn't use imperial units: it uses "US customary" units. Some of them are the same, but others are not. For instance, a gallon in the UK is very different from a gallon in the US, which causes miles-per-gallon ratings to be quite different between the two countries. The UK's gallon is properly called an "imperial unit" since the British actually had an Empire; the US did not.

blkhawk• 3 years ago

As cool as space elevators are - I wish all the other "easier" to build options would be more mainsteam. Say orbital hooks or maybe some of the more sedate active support structures like orbital rings or lauch loop variants.

davidpronk• 3 years ago

Very very nice. Love the details and the °F/°C toggle.

"...above this altitude your saliva and tears will boil if you don't have a pressure suit." :-$

pavon• 3 years ago

And it puts a suit on for you if you don't select one. No stickman snuff animations here.

ChrisMarshallNY2• 3 years ago

This was great!

Niggle: With a trackpad, you might need to scroll "down." I thought it wasn't working, for a few seconds, but that's a fairly common issue with trackpads and mobile interfaces. "Up" and "down" are kind of relative.

penguin_booze• 3 years ago

You may have to toggle the "Australian mode".

globular-toast2• 3 years ago

Not with mine. You have your trackpad set reverse to mine which is default in some systems because kids expect it to work more like a smartphone/tablet rather than a scroll wheel.

ChrisMarshallNY2• 3 years ago

I just have it at Apple default. It is the same as scrolling windows, but "up" is interpreted differently, in my brain (not a kid. I'm an old fart).

actionfromafar• 3 years ago

Caproni Ca.161 1938 altitude record

Insane. 17k meters.

Also there were many others which surprised me.

unixhero• 3 years ago

I enjoyed that greatly.

csomar2• 3 years ago

Couple of things I learned from this:

1. Some birds go really high into the sky. Not sure how they evolved to tolerate such a hostile environment. But it seems that Duck-like birds are able to handle very high altitude.

2. There are lots of cool spaceships that man has made. But it seems most of these were made in the 1950-1990 era. It's a shame that we are no longer doing that.

Xenoamorphous• 3 years ago

I wonder how they estimated the flying altitude of pterodactyls.

amenghra• 3 years ago

Altitude of current birds x wing size ratio /s

ljf• 3 years ago

https://www.npr.org/2010/11/16/131362653/peerless-pterosaur-...

Seems to be a good chunk of (educated) conjecture.

O5vYtytb• 3 years ago

I have to wonder what you mean we're no longer making cool spacecraft? The SpaceX starship is about to launch in an hour, it's very cool.

millerm2• 3 years ago

Watching the countdown now! T-00:28:12! Will be spectacular no matter what happens! Yes, I'm excited. Not sure how the parent comment has missed what SpaceX has been doing with Dragon, Starship, Starlink, and all the rockets! Amazing.

csomar2• 3 years ago

Yep. But you'd expect that we'd have more given how much technology has advanced and how bigger the economies are now. The recent progress is mostly due to Billionaires now.

Another possibility is: Space is too hard. So instead the focus is to analyze (ie: James Webb) instead of sending a human there.

brvsft2• 3 years ago

To your 2nd point, I'd venture an uneducated guess that the reason we were doing this was largely a part of the arms race between USA and USSR during that period.

jackmott42• 3 years ago

List of cool spaceships being worked on now or recently:

* The Falcon 9, the first partially reusable spaceship that actually costs less than not re-using anything

* Terran R - a fully reusable space ship in the works by relativity space

* RocketLab Electron - an active rocket that is unique in its use of electric turbo pumps, 3d printed engines, and advanced composites use

* RocketLab Neutron - in the works, a larger rocket with the aim to be partially re-usable ala Falcon 9 but with a cheaper expendable 2nd stage and simpler design

* SpaceX Starship - in the works, (test flight today!) a large heavy lift vehicle with the aim to be fully reusable

* Blue Origin - working on a ship similar to starship

there are others!

andorov• 3 years ago

SpinLaunch is pretty interesting too - throwing ships into space https://www.spinlaunch.com/

avhon1• 3 years ago

Sierra Nevada Corporation's Dream Chaser - a reusable lifting-body spaceplane, currently slated to fly to the ISS on top of the Vulcan rocket in December 2023

outworlder4• 3 years ago

* The Falcon 9, the first partially reusable spaceship that actually costs less than not re-using anything

We don't really know that. This _appears_ to be the case but the accounting is strange. We would probably get better numbers if the company was publicly traded.

I really like the RocketLab designs.

Where's the funding for Skylon? Some US company with deeper pockets should license the design (the heat exchangers are incredible)

Joeri• 3 years ago

Stoke Space is building a fully reusable rocket with a really unique second stage design.

https://youtu.be/VzqhZLgpiv0

swader999• 3 years ago

I think there's a lot of craft we just don't know about.

codethief• 3 years ago

It's a shame that we are no longer doing that.

"We" have built a lot of spaceships since then but they simply went higher up than "just" 100km, so don't show up in the OP.

ZeljkoS• 3 years ago

Regarding 1, wikipedia about Rüppell's vulture (highest-flying bird) explains the adaptation: "The birds have a specialized variant of the hemoglobin alphaD subunit; this protein has a great affinity for oxygen, which allows the species to absorb oxygen efficiently despite the low partial pressure in the upper troposphere. A Rüppell's vulture was confirmed to have been ingested by a jet engine of an airplane flying over Abidjan, Ivory Coast on 29 November 1973 at an altitude of 11,300 m (37,000 ft)." https://en.wikipedia.org/wiki/R%C3%BCppell%27s_vulture

hobo_in_library• 3 years ago

I was shocked to see a butterfly above the cloud level

kmote00• 3 years ago

Yes, and the bumblebee was up there pretty high too. You gotta wonder, what were they doing up there? Did they just get... lost? Just taking a nap in a thermal updraft?

mcv4• 3 years ago

Swans and geese may not look like the greatest flyers when they're on the ground, but they're among the highest flying birds. But why? Is it their size and strength? Why do people have trouble breathing at that altitude, but birds don't?

joemi• 3 years ago

I think there are still a lot of cool ones, but not as many sexy ones. Rocket planes like the X-15 were incredibly sexy, IMO, though in many ways not as cool and useful as current rockets.

nojs• 3 years ago

3. The temperature gradient is weird, and doesn’t just get colder the higher you go.

JOnAgain• 3 years ago

Height is in m, but temperatures are in f. Complete unusable :)

I loved this.

mpsprd• 3 years ago

Maybe it depends on your location? I see celcius here.

yurishimo• 3 years ago

I think it depends on your browser language? I saw meters and Fahrenheit as an English speaker in NL. You can click on the temperature to toggle the units.

karthickgururaj• 3 years ago

Click on it - the unit changes

Karsteski• 3 years ago

This is absolutely fantastic, I'm sharing it with everyone I can :)

xg15• 3 years ago

"Above this altitude is known as the 'death zone', because there isn't enough oxygen for human life."

whooper swan casually floats by

obituary_latte• 3 years ago

Very cool. Only wish we could switch from meters to feet the same way we can switch between Celsius and Fahrenheit.

isghoor• 3 years ago

So cool!

brvsft2• 3 years ago

Very cute way of conveying this information. Love it.

ibdf• 3 years ago

The space elevator music was particularly good.

seanplusplus• 3 years ago

This was absolutely wonderful ... A perfect way to start my day

nayuki• 3 years ago

A scrolly solar system with a similar presentation style: https://joshworth.com/dev/pixelspace/pixelspace_solarsystem.... , https://hn.algolia.com/?query=If%20the%20moon%20were%20only%...

dxbydt• 3 years ago

(Sorry, am not a science person). Why does the temperature go down until 11000 metres, then stay at -70F until 20000m, then starts going back up to 28F until 50000m, then starts going down again 83500m, stays at -119F until 90500m, rises up again until 100000m ?

uncertainrhymes• 3 years ago

That is the measured air temperature, but it isn't used the way we normally think about it. At very high altitudes, the atmosphere is very sparse (i.e. very low pressure). There are not very many molecules of air, but those few do get hit with a lot of ionizing radiation, meaning they have a lot of energy.

It would not feel warm to you though, it would feel basically like space.

This is a poor analogy, but consider the difference between a single drop of water hitting your skin at high speed, versus a slow moving wave of water going over you. The drop has more energy, and if you just measured its 'speed' it would be higher than the wave.

marcodiego• 3 years ago

It shows temperature and altitude... would be very interesting if it also displayed pressure.

EDIT: and curves.

gooseyman• 3 years ago

I learned that temperature drops until just before the mesosphere where it starts to increase before dropping again. Wild!

TravisLS• 3 years ago

This is great! But also, in case you missed it, click back to the homepage. There are a bunch of other equally great diversions.

mike10921• 3 years ago

Very impressive. So few entertaining websites of this type these days. I really enjoyed it

lobo_tuerto• 3 years ago

This was fun, thanks for the experience. :)

I see you can switch degrees from °F to °C, thanks.

Would be nice to have a switch from m to km, too.

elbigbad• 3 years ago

I’m a simple hacker news lurker. When I see a post that links to Neal.Fun I click. Always such high quality work

gsanderson• 3 years ago

Me too! They are always great.

TimMeade• 3 years ago

Well. Neal. That was fun. Thanks

macrael• 3 years ago

Anyone have an RSS feed for Neal.fun?

nivethan• 3 years ago

He has a newsletter which seems to function as an rss feed. Also his twitter is fun to read!

AlbertCory• 3 years ago

Space elevator: an idea that resurfaces every 5 years or so, until the practicalities get (re)discovered.

Is there any prospect at all of a material strong enough to handle this?

seabass-labrax• 3 years ago

Ah yes, I thought, scrolling past the Learjet 45, the de Havilland Vampire, the Caproni Ca.161, all high-tech jet aircraft of the space age... hang on, the Ca.161?! I must say I'm sceptical that such a single-engined biplane could reach 50000 feet. The most advanced piston-powered aircraft, the four-engined Lockheed L-1649 Starliner, had a cruising altitude of no more than 30000 feet.

winrid• 3 years ago

Wow, this is beautiful and well done.

Also, didn't realize how badass Monarch Butterflies are.

sam1234apter• 3 years ago

Please change the height to feet

Julesman• 3 years ago

Or at least change Fahrenheit to Celsius. heh.

archibaldJ• 3 years ago

This is beautiful. I cried. And then I bought Mr Neal a coffee.

the space elevator.. it is a story of human progress .. it is something we will get to build one day

robswc• 3 years ago

Wow, I really love these sites. Reminds me of years ago when things on the internet were more fun... sure a bit janky but people just went to town and built stuff they wanted.

Now everything is pretty mute and minimal (not saying its bad, I do this for my UX/UI too) so its nice to see this stuff!

classified• 3 years ago

Absolutely beatiful. And using the metric system, how refreshingly un-American.

samuelzxu• 3 years ago

Sprites are AWESOME! They look so cool, does anyone know a good place apart from wikipedia to read about them?

whiterock• 3 years ago

Now please somebody create this in the opposite direction :) Down the mariana trench and beyond.

eveningsteps• 3 years ago

Oh, you'd be surprised! https://neal.fun/deep-sea/

ilikehurdles2• 3 years ago

I don't usually complete these little "fun internet" experiments but I thoroughly enjoyed this journey from start to end, and learned a bit on the way. My mind was blown a few times checking on the scrollbar thinking it's always over only to see we've barely just begun. Excellent.

sph• 3 years ago

It's not the first time I happen upon Neal's fun experiments, and I always love them.

As soon as I see the domain neal.fun, it is a must click.

ilikehurdles2• 3 years ago

Correction: almost* not always.

d_burfoot• 3 years ago

I used to think that the space elevator is a great and necessary concept for building a space-based civilization. How else can we get enough raw physical material into space? There's no way rockets can scale up to the enormous tonnages that will be required.

Now I think the solution is to build an industrial base on the moon. The lunar factories and mines (mostly run by robots) will harvest the necessary material, do some initial refining, and then fling the products into space using mechanical techniques (something like SpinLaunch, or a giant catapult). Lifting off from the moon is far easier than getting off the Earth (think of that tiny lander that the Apollo astronauts used).

barbs2• 3 years ago

Doesn't seem to work on my phone - it won't scroll at all.

iPhone SE 2016 - iOS 15.7.3

matthew16550• 3 years ago

For todays lucky 10,000.

Arthur C Clarke wrote a great story about space elevators called "The Fountains of Paradise".

https://arthurcclarke.org/site/legacy/fiction/fiction-sz/

runlevel1• 3 years ago

Time of useful consciousness would be another interesting number to add. Here's a table of average times published by the FAA for a gradual ascent:

- 18,000 ft; 5,500 m: 20-30 min

- 22,000 ft; 6,700 m: 10 min

- 25,000 ft; 7,600 m: 3-5 min

- 28,000 ft; 8,550 m: 2.5-3 min

- 30,000 ft; 9,150 m: 1-2 min

- 35,000 ft; 10,650 m: 30-60 sec

- 40,000 ft; 12,200 m: 15-20 sec

- 43,000 ft; 13,100 m: 9-12 sec

- 50,000 ft; 15,250 m: 8-10 sec

Here's a demonstration of the effects of hypoxia and time of useful consciousness done in a hyperbaric chamber by SmarterEveryDay: https://www.youtube.com/watch?v=kUfF2MTnqAw

[1] https://en.wikipedia.org/wiki/Time_of_useful_consciousness

mojomark• 3 years ago

I'd now like to go down to the core, please!

poulpy123• 3 years ago

Things I learned here:

- butterfly can fly crazily high (3500m)

- You can find Pterodactyls and wild Yaks higher than a cessna

- a vulture can fly higher than a passenger plane (regular altitude)

jrootabega2• 3 years ago

If this is true, I predict we will find LeVar Burtons at 7000m.

AdrianB1• 3 years ago

The Cessna part is wrong, I can reach over 4000 m in one. The only problems are lack of pressurization and the quantity of fuel to burn to get there, not actually reaching it. In a good day (cold weather, air more dense) it can get even higher.

graupel• 3 years ago

I handed this to a 12-year-old and am now having trouble getting him off the site for day #2 in a row; between Space Elevator and the rest of Neal.fun it's a whole new world for him - love it!

r0b05• 3 years ago

I always enjoy using this site.

Anyone know the tech stack used to make these?

sourcecodeplz• 3 years ago

Amazing website.

Space Elevator

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