Post by Johnny1A Post by J. Clarke Post by Dorothy J Heydt Post by Paul Colquhoun
|>> On Wed, 15 Apr 2020 21:46:07 -0700 (PDT), Quadibloc
|>>>> Not bloody likely. What would anyone want to build on the Moon?
|>>> How about a big telescope?
|>> What does the moon bring to the game? It's just another gravitational
|>> field distorting the optics. We already have the technology to build
|>> free-flying telescopes that don't have that problem and can be
|>> arbitrarily large.
|> The far side of the Moon is most radio-quiet spot in the entire solar
system. It's an ideal
|> place to put radio telescopes.
| Well, it WOULD be an ideal spot if it weren't for the "minor" fact that
| it's also the HECKIN' COLDEST SPOT IN THE INNER SOLAR SYSTEM, for very
| similar reasons as to why it's the most radio-quiet spot.
I think you are getting mixed up with Mercury.
If, and only if, he's not paid much attention to Mercury over the
last several decades.
We can (most of us) remember the time Larry Niven published "The
Coldest Place," which turned out to be the dark side of Mercury,
and Mercury's INN-teresting rotational period and orbital period
were discovered before the story went to press.
Post by Paul Colquhoun
The far side of the Moon
gets the same 4 week day/night cycle as the near side does (minus the
Putting everything except the dish underground would probably be the
best design anyway.
Quite possibly; enough rock and regolith over the living quarters
would help keep radiation damage down.
I stilld don't know how much damage living under 1/6 G for months
or years would do.
Would it actually do _any_ damage relevant to someone living on the
_Nobody knows._ That's the thing, we have exactly _zero_ data to work with, and science must be silent when there is no data.
It's entirely possible, and maybe plausible, that living on the Moon for years on end would leave you still healthy and functional on the Moon, but unable to safely come back to Earth. That _could_ be true.
Robert Heinlein used this as a plot point in _The Moon is Harsh Mistress_.
It necessitated that the criminals and political prisoners exiled to the Moon
could never return even with a change in government policy. Workers such as
the astronomers at the Lunar observatory and tourists avoid this problem by
the use of centrifuged living quarters. Decades after the Lunar residents won
independence drugs are developed that prevent loss of gravity tolerance.
This was specific to the story; in his earlier "future history" short story
_It's Great to be Back_, a married couple returning to Earth after several
years working in Luna City find the gravity annoying but not medically
dangerous. In the YA novel _Space Cadet_, one of the entering students at
the Space Patrol academy on Earth is from a colony on one of the Jovian moons
and has difficulty at first with gravity, but this is seen as no barrier to
a career in the Patrol, and on the other hand he has no problem with space
sickness. In _Podkayne of Mars_, lifelong Mars residents Podkayne and Clark
Fries embark on a vacation to Venus and then to Earth with no great concern
over gravity. To aid adaptation the ship they are traveling on gradually
increases its spin rate to increase the artificial gravity from Mars equivalent
to Venus equivalent, and both siblings combine this with intense weight
training in the ship's gym.
Post by Johnny1A
It could also be true that even after months or years, once could eventually readjust to 1G and normal Earth surface conditions, though it would likely be difficult. That could also be true.
It could also be true that long term life on the Moon would be crippling or lethal, even in terms of Lunar residency.
We just don't know.
We also don't know if there are differences in how males and females adapt to Lunar conditions. We don't know if it's possible to carry a healthy baby to term under those conditions. We don't know what the long-term effects of growing up under 1/6G would be.
I'm not being negative. I'm simply pointing out that we have no data at all. One useful purpose of a research station on the Moon would be studying the effect of 1/6G on living creatures, including humans.
I agree, but I see no reason to think that 1/6 G will be worse than zero G,
and people have spent over a year on the space station and survived the
return to Earth. We have built up to deployments of this duration gradually
over years, with careful monitoring and using a wide variety of exercise
devices and techniques. Years ago I read about an idea for sort of a
compartmentalized pressure suit that would provide its wearer in free fall
with the same head-to-toe fluid column pressure gradient that we experience
when standing upright on Earth. It was theorized that this could help keep
their cardiovascular system in shape. I don't know if this was ever tried
in orbit or how well it worked. One thing that they have NOT tried, to my
knowledge, is the old science fiction standby, rotational artificial gravity.
Research over the last forty years on bone loss in older people has shown the
great importance of mechanical stress on the bones. Test subjects assigned
at random from a group to exercise by jogging increased bone density in their
legs, while people selected from the same group to use weight machines
increased density in the bones involved in that activity. It could be
that something as simple as a ballasted suit worn during workouts or routine
activities would be useful. Suppose an astronaut had a mass of 90 kg. A suit
with a mass of 450 kg would bring their Moon weight up to their Earth weight,
and could be built with just 0.06 cubic meters (two cubic feet) of steel.
Average thickness would be one or two centimeters, which would be no
bulkier than Iron Man.