Questions tagged [the-moon]

Questions about Earth's Moon. Also for questions about spacecraft, manned missions, potential missions, etc. related to Earth's Moon.

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2 votes
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What is the optimal acceleration for a direct ascent to the moon? [duplicate]

If a rocket flies to any object using a direct ascent it is best for it to reach the needed speed as soon as possible because of the Hohmann effect. When it launches from the ground there is air ...
1 vote
2 answers
132 views

Is the Artemis Missions direct ascent?

I’ve been looking at “exploded” SLS rockets, where the stages are all shown, and there never seems to be a lunar lander. Does that mean that the Orion Spacecraft lands on the moon, or will it have a ...
5 votes
1 answer
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+50

How to protect Mars/Moon mission crews against meteors?

Humans are expected to return to the Moon (see Artemis) and maybe go to Mars (see this and this) within a decade or two. Meteors frequently strike the surface of both the Moon and Mars (one can't ...
3 votes
1 answer
69 views

Secondary radiation on the moon? (reference request)

I am studying the radiation environment on the moon and would like to read about how secondary radiation has been measured, simulated or even estimated for the lunar surface. Has this been done? If so,...
-6 votes
1 answer
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did the Apollo ascent module have a rocket motor?

I was watching this video of an Apollo ascent module taking off (captured by a lunar rover credit: NASA) and there is no evidence of a rocket motor not even a glint of light that would signal rocket ...
3 votes
1 answer
1k views

What happened to the Apollo moon rovers? [duplicate]

I wonder, what happened to the moon rovers? Were they left behind or brought back?
9 votes
1 answer
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Why are Moon Rockets (Saturn V, N1) so much bigger than the Titan IIIE?

In what little knowledge of space and rockets I have, it seems to me that the further the object your aiming for, the more fuel you’ll need, and the bigger engines you’ll need. Having compared the ...
2 votes
1 answer
212 views

How did the Lunar module reached orbit speed?

How does the lunar module of Apollo 11 reached an orbit speed of 1600 meter/second in order to rejoin the CSM (Command/Service Module)? Additional question, Where are the Oxygen & Fuel tanks of ...
1 vote
0 answers
78 views

Could it be more cost-effective to refuel with on the lunar south pole produced methalox instead of refueling methalox in LEO, on the way to Mars?

In the article Prominent volcanic source of volatiles in the south polar region of the Moon it is calculated that 8 x 109 kg $CO_2$ has been vented billions of years ago by pyroclastic events in the ...
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6 votes
1 answer
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Could the Moon's gravitational anomalies be used constructively?

The moon has a habit of de-orbiting passive satellites in low orbit because it is not a homogeneous ball. Any orbit therefore passes through different sections with different surface gravities. This ...
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3 votes
0 answers
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Is a geosynchronous (SSO-like) polar orbit around the Moon possible? [duplicate]

Imagine the equivalent of a sun-synchronous Earth orbit, just substituting the Moon for Earth and Earth for Sun. Such an orbit would have to have the following properties: It would be a polar or near-...
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-2 votes
3 answers
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Why fly to the moon when you can fly away?

I am not a NASA employee or a scientist, but why do we fly to the moon when it looks easier to fly away from it and wait for it to approach the craft. Then put something permanently in a polar orbit ...
8 votes
2 answers
212 views

What will the live video and audio quality be like when astronauts next set foot on the moon?

What will the live video and audio quality be like when we watch an Artemis crewmember set foot on the moon? The quality of the original Apollo footage from the 1960's is terrible by today's standards....
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2 votes
2 answers
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Could dust kicked up from the Apollo landings reach Earth intact?

According to various sources (1,2, and 3) lunar landings kick up a lot of dust at very high speeds. Is it possible that some dust was able to get fast enough to escape the moon, fall towards Earth, ...
3 votes
2 answers
157 views

Sub Lunar Mining

What mineable Lunar mineral deposits are valuable enough to offset mission costs. I have read perhaps cobalt, titanium, lithium, helium and maybe obsidian?
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0 votes
2 answers
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Could lunar gate components be 3D printed and assembled in Low Lunar Orbit

Could Lunar Gateway Components be 3D Printed and assembled in a low level lunar orbiting space station and then be handled by space or sky crane type equipment?
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7 votes
1 answer
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Moon Suit to be used for the Artemis III mission?

The Moon landing mission Artemis III is scheduled for launch in 2025. It will be the first Lunar crewed mission after Apollo. What is the development state of the moon suit to be used for moonwalks ...
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7 votes
5 answers
2k views

Gravitational field of the Moon and Earth

Is there any method to find a point or plane in space where the gravitational field of the Moon and Earth are the same? And if so, what happens to a spacecraft if it passes through that point or ...
1 vote
1 answer
66 views

Historical Moon’s True Anomaly Numbers

What are moon’s true anomaly angles for new moons in year 1994? Cannot find historical true anomaly numbers on the internet.
6 votes
3 answers
129 views

Is crater counting accurate for relative dating between celestial bodies?

This Planetary Society article explains how crater density per unit area on the lunar surface helps identify what regions are older/younger than others. It also mentions that this chronology can be ...
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-1 votes
1 answer
140 views

Could we launch from the moon to another planetary body? [closed]

Would it be possible with currently rocket technology or technology towards the end of its development (ex. SLS, Starship, New Glenn, etc.) to launch from the moon. Of course, we would send down a ...
-1 votes
1 answer
221 views

Can we launch from the moon?

Would it be possible with currently rocket technology or technology towards the end of its development (ex. SLS, Starship, New Glenn, etc.) to launch from the moon. Of course, we would send down a ...
6 votes
0 answers
150 views

Will a watermelon decompose on the Moon?

If someone placed a watermelon or any other type of fruit on the Moon, will it decompose?
1 vote
2 answers
533 views

Why doesn't NASA fly its rockets on suborbital trajectories to the Moon?

After trying it out in Kerbal Space Program for a while, I was wondering why NASA doesn't fly on suborbital trajectories to the Moon. When I tested this idea in Kerbal Space Program I found out that ...
3 votes
1 answer
434 views

Why is the LROC lunar data not showing farside of the moon?

This data does not include the far side, why not? e.g I want TiO2 on the far side: https://quickmap.lroc.asu.edu/layers?extent=-90,-28.758929,90,28.758929&proj=10&showGraticule=true&layers=...
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2 votes
1 answer
72 views

Antenna wrap material suitable for lunar & cis-lunar environment

I am looking for a wrap (station) antenna for a transceiver (in space/lunar) Not all materials are suitable for the space environment. Does anyone know what wrap antenna materials I can use? I have ...
3 votes
0 answers
64 views

Is the impact of Chang’e 5-T1 rocket stage on the Moon's far side on March 4th likely to launch any debris into Moon or Earth orbit?

It is predicted that the Chang’e 5-T1 rocket stage will impact the Moon's far side on March 4th. The stage apparently weighs about 4 tonnes and will impact at 2.5 km/s at a shallow angle. There's ...
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2 votes
0 answers
42 views

Which spacecraft have entered lunar orbit through L1?

I'm examining entering lunar orbit through the Earth-Moon L1 point with low-thrust propulsion. As part of this, I'm interested in all examples of spacecraft (both actually flown and ones that didn't ...
2 votes
0 answers
36 views

Are there publicly available ephemerides for any Moon-orbiting satellites?

I am currently working on expanding an orbital propagator to cover satellites that do not orbit Earth. For starters, I am trying to expand it to Moon-orbiting satellites. I have managed to reconstruct ...
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4 votes
2 answers
171 views

How can you get nitrogen and carbon enough to make air (after adding oxygen and reacting the carbon with oxygen to form carbon dioxide) on the moon?

I'm working on a moon base for a project and I need to make air. I know that you can get oxygen and hydrogen by electrolysing water which is present in abundance on the moon. I need to mix nitrogen, ...
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2 votes
1 answer
113 views

How did this upper stage end up on a collision course with the moon?

The upper stage of the Falcon 9 rocket that launched the DSCOVR spacecraft is expected to accidentally crash into the moon soon. How did it get into this position? I found answers here that say it was,...
3 votes
0 answers
88 views

Apollo 11 throttle telemetry: what is this value?

I cannot find any clue in AGC SW about the value in last column of pages 15-23 of "Apollo 11 LM-5 computer words" document: I think it reads: ...
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13 votes
1 answer
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BBC: "In 2009 Prof McDowell & other astronomers performed an experiment in which a similar-sized rocket was crashed into the Moon." Really? Which one?

The line following the title of BBC's Elon Musk SpaceX rocket on collision course with moon reads: A rocket launched by Elon Musk's space exploration company is on course to crash into the Moon and ...
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24 votes
4 answers
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Delta-v to hit the moon: is reaching Lunar L1 enough?

Lot of questions involve shooting things into the Sun. But there are no aliens on the Sun: they are on the Moon. I want to drop things on them, but since there's lot of them, I can just drop a ...
2 votes
0 answers
63 views

How to make diamagnetic lunar simulant that would "float" in a strong enough magnetic field? (for China's 60 cm high field simulator)

Live Science's China builds 'artificial moon' for gravity experiment says: Chinese scientists have built an "artificial moon" research facility that will enable them to simulate low-gravity ...
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8 votes
2 answers
864 views

How long would it have taken to launch an Apollo contingency flight?

How long would it have taken to launch an Apollo contingency flight, if, for example, the lunar lander couldn't have got back up to orbit? Could the lander have held three astronauts?
1 vote
0 answers
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Fuel profile for Apollo 11

I downloaded a dozen of NASA documents about post-flight analysis of Apollo 11 mission, but I cannot find a table or a plot of fuel usage and remains; Some of the documents which I found: http://www....
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12 votes
1 answer
1k views

Why did a solar eclipse of the sun as seen from Apollo 11 appear to have an elliptical corona?

When asked to recount an experience from the Apollo program, Neil Armstrong stated: [My] most indelible memory was approaching the moon and flying through the moon shadows so that the moon was ...
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1 vote
0 answers
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Who is going to the Moon in 2022? How many planned missions to land something there?

How many planned missions are there that plan to land something on the Moon in 2022? Secured access to launch necessary to count, no washing-machine with bottle-rocket missions. Please include a link ...
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0 votes
1 answer
103 views

Where are the meteorite remnants related to the craters they've produced on the moon?

On Earth, in every crater there's usually at least some remnant of a meteorite. But with all the craters on the Moon, where are the meteorites in the middle of them?
5 votes
2 answers
430 views

Approximate size of the "hut" object observed from the Yutu-2 lunar rover?

News sources (for example, the Independent, the South China Morning Post, RT, and Newsweek) have reported recently on the observation from the Yutu-2 lunar rover of a "hut" object or "...
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9 votes
1 answer
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Time-scale for investigation of the "hut" object observed from the Yutu-2 lunar rover

According to Adam Smith writing in the Independent about the object that was recently observed in a photo taken from the Yutu-2 lunar rover: (t)he strange cube was spotted on the horizon around 80 ...
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2 votes
1 answer
109 views

Do reversible proton-exchange membrane hydrolizer/fuel cells exist? Have they been incorporated into a “Hydrogen Battery”?

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-...
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14 votes
3 answers
3k views

Projecting shadows, or even a movie, on the moon

Would there be a way to project shadows, or even a short movie on the moon, i.e. using the moon as a cinema screen and the sun as a projector? To be more precise, if a cubesat was launched towards the ...
14 votes
3 answers
3k views

If we pick any point on the moon (except possibly the poles), is the sun visible for 13.66 days, and then not visible for 13.66 days?

The moon is tidally locked to the earth. The moon's orbital period is 27.32 days. Does that mean that if we pick any point on the moon (except possibly the poles), the sun should be visible for 13....
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12 votes
2 answers
319 views

Is lunar exploration going to need a whole heck of a lot of RTGs? If so, have they started firing up the RTG-making reactors yet?

The November 16, 2021 Northrop Grumman Press Release Highly specialized team to design vehicle for sustainable lunar surface mobility operations begins Northrop Grumman Corporation (NYSE: NOC), is ...
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0 votes
2 answers
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Are valleys a good alternative to caves for radiation shielding?

Lava tube systems and caves have been discussed a lot when it comes to establishing a base on the Moon or Mars in order to protect it from the continuous exposure to lethal radiation, as well as ...
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2 votes
1 answer
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Was Chandrayaan-1 recovered (tracked) only that one time in 2016, or is someone still keeping an eye on it from time to time?

Has there ever been probability of conjunction between spacecrafts in Lunar orbit? describes a recent maneuver of two spacecraft in orbit around the moon to avoid a potential collision: Apparently ...
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2 votes
1 answer
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What kind of rocket design would be used for Lunar/Mars E2E travel when colonized?

If/When Mars or the moon are colonized, transport will be needed between bases. Over long distances, rovers would be too slow and traditional aircraft would not work well in thin to non existent ...
7 votes
2 answers
504 views

Why did Luna 1 enter a heliocentric orbit?

The way I understood it (please correct me if I'm wrong), the easiest (least energy) way to reach the Moon it to put the spacecraft into a highly elliptic geocentric orbit whose apogee reaches the ...
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