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Reminder that the moon does not have a "dark side". This is a misnomer. The back of the moon gets the same amount of sunlight as the front. Unless you mean the

Reminder that the moon does not have a "dark side". This is a misnomer. The back of the moon gets the same amount of sunlight as the front. Unless you mean the side which is not presently illuminated. Water could freeze there but it would boil off again when the sun lights it up again. However there are craters at the poles that never experience sunlight, and water does accumulate in them. You don't need any atmosphere to hold water vapor - the water vapor itself is held in the moon's gravity well and floats around until it cools somewhere, such as these craters.

thaumasiotes 4y ago
> Reminder that the moon does not have a "dark side". This is a misnomer. It isn't. The side of the moon that cannot be seen from Earth is called the dark side of the moon. It's called that for the same reason that the Dark Ages are called dark: because we can't see them. It is true that the dark side of the moon gets just as much sunlight as the light side does.
- duggan 4y ago
  Sounds like something a person living on the dark side of the Earth would say.
- gattilorenz 4y ago
  AFAIK the "Dark Ages" are named like that because the Renaissance people thought they were enlightened, compared to the "barbaric people" who lived before them, not because we have less documents (although we do)
  - housecarpenter 4y ago
    Perhaps originally, but the reason it persists as a term even when used by people who don't think medieval people were relatively unenlightened is that it can also be construed as referring to the lack of documents. (And for those who do regard medieval people as relatively unelightened, they might regard the lack of documents as something intrinsically associated with that.)
- stametseater 4y ago
  The context was thermal energy received from the sun, not attention received from man. Your clap-back might make sense when somebody is criticizing Pink Floyd, but it doesn't make sense here.
- johnwalkr 4y ago
  I work in aerospace (lunar exploration actually), and everyone involved goes out of their way to always use the term far side and explain to laypeople about it. Regardless of its origin, I've commented on it in conversation at least a dozen times and I don't think I've yet had the other person use the phrase and not also think there is a permanently dark side of the moon. Online there is often also some pedant who explains "well actually there is a dark side but it changes". Because your last sentence is about sunlight I actually interpreted "dark side of the moon" as the unlit/ lunar nighttime side on the first several reads. Anyway it can be interpreted at least three ways: - Referring incorrectly to the far side - Referring correctly to the far side because actually dark means something else (but it will be interpreted incorrectly anyway) - Referring to the side currently in lunar nighttime The terms "near side", "far side", "lunar night" and "lunar day" are much better.
chiefalchemist 4y ago
Why does the water vapor gravitate to the poles? Also, if there is X amount of water, and ever thaw / freeze cycle loses some amount Y, can't we estimate what X was Z years ago?
- johnwalkr 4y ago
  It doesn't really gravitate to the poles, it's just that once water reaches a permanently shadowed bit of a crater, it stays there forever.
whitehexagon 4y ago
>The back of the moon gets the same amount of sunlight as the front. silly me, yes even better then, since in theory there should always be some amount of water vapor floating around? I just recall a weather phenomenon in Finland when the atmospheric temperature drops sufficiently that even the water vapor freezes and falls like 'stardust'. So would a big sun shield on the moon create a similar temperature drop allowing capture the ice crystals? maybe the moons gravity is insufficient.
bqmjjx0kac 4y ago
> The back of the moon gets the same amount of sunlight as the front. Actually, doesn't the back get more sunlight? The front of the moon is occasionally eclipsed by earth.

thaumasiotes 4y ago

> Reminder that the moon does not have a "dark side". This is a misnomer. It isn't. The side of the moon that cannot be seen from Earth is called the dark side of the moon. It's called that for the same reason that the Dark Ages are called dark: because we can't see them. It is true that the dark side of the moon gets just as much sunlight as the light side does.

duggan 4y ago
Sounds like something a person living on the dark side of the Earth would say.
gattilorenz 4y ago
AFAIK the "Dark Ages" are named like that because the Renaissance people thought they were enlightened, compared to the "barbaric people" who lived before them, not because we have less documents (although we do)
- housecarpenter 4y ago
  Perhaps originally, but the reason it persists as a term even when used by people who don't think medieval people were relatively unenlightened is that it can also be construed as referring to the lack of documents. (And for those who do regard medieval people as relatively unelightened, they might regard the lack of documents as something intrinsically associated with that.)
stametseater 4y ago
The context was thermal energy received from the sun, not attention received from man. Your clap-back might make sense when somebody is criticizing Pink Floyd, but it doesn't make sense here.
johnwalkr 4y ago
I work in aerospace (lunar exploration actually), and everyone involved goes out of their way to always use the term far side and explain to laypeople about it. Regardless of its origin, I've commented on it in conversation at least a dozen times and I don't think I've yet had the other person use the phrase and not also think there is a permanently dark side of the moon. Online there is often also some pedant who explains "well actually there is a dark side but it changes". Because your last sentence is about sunlight I actually interpreted "dark side of the moon" as the unlit/ lunar nighttime side on the first several reads. Anyway it can be interpreted at least three ways: - Referring incorrectly to the far side - Referring correctly to the far side because actually dark means something else (but it will be interpreted incorrectly anyway) - Referring to the side currently in lunar nighttime The terms "near side", "far side", "lunar night" and "lunar day" are much better.

chiefalchemist 4y ago

Why does the water vapor gravitate to the poles? Also, if there is X amount of water, and ever thaw / freeze cycle loses some amount Y, can't we estimate what X was Z years ago?

johnwalkr 4y ago
It doesn't really gravitate to the poles, it's just that once water reaches a permanently shadowed bit of a crater, it stays there forever.

whitehexagon 4y ago

>The back of the moon gets the same amount of sunlight as the front. silly me, yes even better then, since in theory there should always be some amount of water vapor floating around? I just recall a weather phenomenon in Finland when the atmospheric temperature drops sufficiently that even the water vapor freezes and falls like 'stardust'. So would a big sun shield on the moon create a similar temperature drop allowing capture the ice crystals? maybe the moons gravity is insufficient.

bqmjjx0kac 4y ago

> The back of the moon gets the same amount of sunlight as the front. Actually, doesn't the back get more sunlight? The front of the moon is occasionally eclipsed by earth.