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Results tagged with the-moon
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user 44272
Questions about Earth's Moon. Also for questions about spacecraft, manned missions, potential missions, etc. related to Earth's Moon.
10
votes
If we pick any point on the moon (except possibly the poles), is the sun visible for 13.66 d...
It’s interesting that you excluded the poles from your question. If the Moon’s axis was perpendicular to the ecliptic, you could (in theory) mount solar panels on a vertical mast at the poles and cont …
- 27.8k
6
votes
Why did Luna 1 enter a heliocentric orbit?
According to the Wikipedia article on Luna 1, “The Soviet engineers did not trust automated systems for controlling the engine burns, so they communicated to the rocket via radio. The signal to stop f …
- 27.8k
1
vote
Mass of a circumlunar power transmission line?
The conductor mass depends on design criteria. The following assumptions were plugged into http://wiresizecalculator.net
-Transmission line is 5000km long
-Single phase AC (two wires)
-Aluminum conduc …
- 27.8k
3
votes
Could the Moon's gravitational anomalies be used constructively?
I’d say “No” to both questions.
It is bewitching to think of a lunar satellite surfing the gravity potentials like a soaring sea-bird, higher and higher…
But my intuition says “no”. A frictionless rol …
- 27.8k
2
votes
Pool on the Moon?
Answer: Not long to live. Assuming he is not hypothermic, he will be unconscious in about a minute and brain dead in 4 minutes.
The hydrostatic pressure at 3m pool depth under Moon gravity is 35mmHg. …
- 27.8k
1
vote
What makes materials on the Moon look so different when the sun is high?
The brightness seen in the photographs is likely due to Heiligenschein. The effect is not confined to "local noon". It is seen at the antisolar point. Because Lunar survey satellite image axis are ver …
- 27.8k
3
votes
1
answer
186
views
Why is the proposed lunar radio-telescope parabolic, rather than spherical like Arecibo?
The Lunar Crater Radio Telescope LRTC is a proposed fixed dish radio antenna to be built in a far-side lunar crater.
https://en.wikipedia.org/wiki/Lunar_Crater_Radio_Telescope#/media/File:Niac2020_b …
- 27.8k
3
votes
Why is the proposed lunar radio-telescope parabolic, rather than spherical like Arecibo?
According to Lunar Crater Radio Telescope (LCRT) on the Far-Side of the Moon NASA Innovative Advanced Concepts (NIAC) Phase 1 Report,
We propose to deploy a 1km-diameter wire-mesh ... to form a
spher …
- 27.8k
11
votes
What is this surface feature near Shackleton crater classified as?
The area is named the “Shackleton connecting ridge” and the “Connecting Ridge Extension” according to https://svs.gsfc.nasa.gov/5013 video https://svs.gsfc.nasa.gov/vis/a000000/a005000/a005013/group …
- 27.8k
3
votes
0
answers
205
views
Lunar power transmission using bare conductors laid on the regolith?
Electrical power transmission on the lunar surface will likely become necessary to join solar farms and lunar facilities, especially if water hydrolysis is used to make hydolox propellant.
Constructi …
- 27.8k
4
votes
0
answers
89
views
Does the low conductivity of regolith limit lunar surface radio communication?
The maximum distance of radio communication depends on the carrier wave frequency. For shortwave, carrier wave range exceeds line-of-sight by utilizing skywave (ionosphere) reflection. Medium carrier …
- 27.8k
1
vote
How is it proposed to extract oxygen from lunar regolith?
Pyrolysis (breakdown by heating) was shown to release oxygen from regolith returned by Apollo missions. See Pyrolysis of regolith can produce hydrogen and oxygen. Is this a viable alternative to water …
- 27.8k
2
votes
1
answer
136
views
Do reversible proton-exchange membrane hydrolizer/fuel cells exist? Have they been incorpora...
Solar power on the Moon suffers from the month-long Lunar rotation which necessitates enough energy storage to last through the 2 week Lunar night.
An alternative to battery storage would be a closed- …
- 27.8k
5
votes
1
answer
521
views
What is the optimum lunar latitude for a solar farm and hydrolysis plant?
What is the optimum lunar latitude for a solar farm and hydrolysis plant?
Water is hypothesized to be present at the lunar poles. There have been proposals to hydrolyzed it into propellant. Large amou …
- 27.8k
4
votes
Alternative small mass payload transportation from the moon to L5 besides rail gun and mass ...
Quenchgun
This is more of an extended comment than an answer since it deals with a type of coilgun design, which is a mass driver and so excluded in the question. However, the quenchgun's much lighter …
- 27.8k