Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

Water exists on the moon, scientists confirm

theguardian.com

Post reply on HN
Print view View original

11–19 of 19 posts

Re: Water exists on the moon, scientists confirm

#11

Post by antepodius »

ipnon wrote: post #5
potiuper wrote: post #2

The water might be able to recycled instead of blasting it into space as rocket fuel if a [para-aramid or ultra-high-molecular-weight polyethylene fibre] lunar orbital elevator could be prioritized before the lunar cell phone network. #lunarproblems

The lack of regulation on the moon suggests that a cell phone network is more imminently useful relative to cost, compared to the usefulness to cost ratio of an orbital elevator.

Ah, but the lunar orbital elevator can also act as a cell tower that covers nearly half the lunar surface

Re: Water exists on the moon, scientists confirm

#13

Post by rriepe »

tnli wrote: post #9
umvi wrote: post #6

Earlier quoted context omitted.

Orbital elevators are still science fiction at this point. There is no known material that can withstand the tensions required. Scientists think maybe carbon nanotube cables would be strong enough, but even then, good luck making a carbon nanotube cable that long.

That's the case for Earth. This would be on Luna, with about 1/6th of the gravity on Earth.

And no wind! But the atmopshere is the reason to build the thing in the first place.

You also can't build one on the Moon because you'd need to reach its "lunastationary" orbit, a point which is more influenced by Earth's gravity than the Moon's.

Re: Water exists on the moon, scientists confirm

#14

Post by ChuckMcM »

hackeraccount wrote: post #10
umvi wrote: post #6

Earlier quoted context omitted.

Orbital elevators are still science fiction at this point. There is no known material that can withstand the tensions required. Scientists think maybe carbon nanotube cables would be strong enough, but even then, good luck making a carbon nanotube cable that long.

parent is speaking of a lunar orbital elevator. Given the gravity involved I doubt material would be the issue. Though there may be problems other then strength of the material - I think the moon's gravitational field is very irregular for example.

This, lunar elevators are well within existing technological capabilities. There have been calls to build a lunar elevator simply to get some practical experiencing in building an elevator.

Re: Water exists on the moon, scientists confirm

#15

Post by giancarlostoro »

hackeraccount wrote: post #10
umvi wrote: post #6

Earlier quoted context omitted.

Orbital elevators are still science fiction at this point. There is no known material that can withstand the tensions required. Scientists think maybe carbon nanotube cables would be strong enough, but even then, good luck making a carbon nanotube cable that long.

parent is speaking of a lunar orbital elevator. Given the gravity involved I doubt material would be the issue. Though there may be problems other then strength of the material - I think the moon's gravitational field is very irregular for example.

This also makes me think of that XKCD whatif article:

https://what-if.xkcd.com/157/

Re: Water exists on the moon, scientists confirm

#16

Post by Annili »

Santosh83 wrote: post #3

Wasn't this already confirmed previously by the Chandrayaan mission among others?

In the third paragraph:

> ... technical limitations meant it was impossible to know if this really was H2O (water) or hydroxyl molecules (consisting of one oxygen atom and one hydrogen atom) in minerals.

Re: Water exists on the moon, scientists confirm

#17

Post by pklausler »

ChuckMcM wrote: post #14
hackeraccount wrote: post #10

Earlier quoted context omitted.

parent is speaking of a lunar orbital elevator. Given the gravity involved I doubt material would be the issue. Though there may be problems other then strength of the material - I think the moon's gravitational field is very irregular for example.

This, lunar elevators are well within existing technological capabilities. There have been calls to build a lunar elevator simply to get some practical experiencing in building an elevator.

Wouldn't a lunar elevator station need to be in a much higher orbit ("selenosynchronous"? is that a word) than an Earth-orbit geosynchronous elevator station due to the ca. 1/28th slower rotation rate?

Re: Water exists on the moon, scientists confirm

#18

Post by [deleted] »

antepodius wrote: post #11
ipnon wrote: post #5

Earlier quoted context omitted.

The lack of regulation on the moon suggests that a cell phone network is more imminently useful relative to cost, compared to the usefulness to cost ratio of an orbital elevator.

Ah, but the lunar orbital elevator can also act as a cell tower that covers nearly half the lunar surface

[deleted]
Post reply on HN