# 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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### Apollo 11 Moon orbital elements [duplicate]

I'm simulating several pieces of the Apollo 11 mission. I'm now at the point of performing lunar landing sequence, and I'm looking for data. I found this report, but it only has partial data, while ...
151 views

### When the moon rock heats up to 600°C, does only Helium comes out?

When lunar rock is heated to 600 °C to extract Helium-3, are gases expelled other than helium? Inductance process would be used in heating the rock.
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### How can 3He be mined on the moon? [duplicate]

Now I know how it is detected, but what would the mining process be like? given that there is a lot on the moon but not concentrated, so you have to process large amounts of surface to extract a ...
71 views

### How could the presence of 3He be detected on the lunar surface?

I have been investigating this isotope of helium for a while, which is extremely abundant on the moon (and in general in the entire solar system except on planets with atmosphere). It is believed that ...
108 views

### What calculations should I do to go from LEO to the moon with an ionic motor?

my question is, what calculations should I do to be able to go from LEO to the lunar orbit? If this were done, two of these thrusters would be used https://www.cubesatshop.com/product/ifm-nano-...
59 views

### How much would reduce the cost of sending kgs to the moon having a 200,000 miles space elevator there?

According to this article/study A space elevator to the moon could be doable Its central element is a cable that would be anchored to the moon and span more than 200,000 miles to a point above ...
112 views

### Where in the Pale Blue Dot image should the Earth's moon be?

In the description of this image it is claimed that Moon should be detectable in famous "Pale Blue Dot" image. Detailed analysis also suggests that Voyager detected the moon as well, but it is too ...
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### Chang'e 4 lunar rover movement

Recently China has released images of the far side of the Moon taken by Chang'e 4 mission's rover Yutu-2. While pictures are really nice and beautiful, I have stumbled to one rover movement feature ...
309 views

### How to solve this exercise in orbital mechanics; the moon stops in its orbit, what happens next?

As an exercise in orbital mechanics, suppose the moon were to suddenly stop orbiting Earth, and instead at time $t=0$ begin moving in the same direction as Earth so that their relative velocity were ...
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### Why does it get hotter in the thermosphere than on the moon?

I would have expected the surface of the moon to be hotter. Both become hot owing to solar radiation.
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### Ascent propulsion system [duplicate]

For lunar module and spacecraft ascent bipropellant hypergolic fuels comprising of N2O4 oxidizer and Hydrazine derivates/blends are used. How on Earth have we accepted such a dangerous, toxic, ...
56 views

### moon's true anomaly at date of new moon

I've seen on this site: https://eclipse.gsfc.nasa.gov/SEhelp/moonorbit.html a table that gives the true anomaly of the moon at the time of new moon. The difference between the true anomaly at one new ...
64 views

### Mass of a circumlunar power transmission line?

The most easily available power source on the Moon is solar power. This has the obvious drawback that the night is two weeks long, during which you would probably still need power for a base to ...
215 views

### Did Project Horizon draft any proposals for small arms weapons for astronauts?

The 1959 Project Horizon discusses building a base on the moon, and also, according to the Wikipedia article, mentions weapons to be used for (of course) fighting the Soviets attacking the moon base, ...
211 views

### Interplanetary spacecraft flight operating system and programming language

Which programming languages and operating systems are mostly used for interplanetary satellites (such as a mission to the moon)? To my knowledge, I know some LEO CubeSats use C programming language ...
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### Building a city on the Moon using inflatable modules, and the Starship as a launch vehicle? [closed]

What are the main challenges for someone (such as Jeff Bezos or Elon Musk) to mass-produce a flight-ready inflatable habitat(1000 of them), capable of sustaining 16 humans, and use them to build a ...
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### What went wrong in the Chandrayaan-2 mission with the Vikram lander?

On September 7th 2019, ISRO attempted to land a lunar lander ,Vikram, with rover , Pragyan, on the moon. It was very exciting to watch until the lander lost communication with ground station during ...
701 views

### Has there been any serious prospect of human landing on the far side of the Moon?

As far as I know, the only serious projects for human exploration of the Moon have been the Apollo project, some other US studies with Gemini capsules and a couple of embryonic Soviet projects. I see ...
89 views

### Dealing with lunar regolith

NASA has announced its intention to return astronauts to the Moon by 2024. Various other questions and answers here address the many dangers and difficulties posed by the fine and abrasive particles ...
101 views

### Has SpaceX said much publicly about uncrewed landings on the surface of the Moon or Mars?

It seems like this would be very good publicity as well as a necessary proof of concept, and SpaceX certainly has some experience with robotic/automated landings on Earth. I'm assuming this will be ...
101 views

### Did Apollo astronauts play on the Moon their pre-recorded music?

Apollo astronauts were equipped with Sony TC-50 cassette voice recorder/player (described in this answer) primarily for recording voice with mission related notes, but they could (and did) listen to ...
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### Would mass drivers be able to transport base material on the moon more efficiently than drones?

I am a hobbyist working on a climate change adaptation idea that is a variation of orbital sun shades. It would project soil/material from the moon to provide targeted shading for whatever part of ...
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### Trajectory Optimization To The Moon (Case Study: Chandrayaan-2)

People always ask this million dollar question of " What is the best path/trajectory to take to reach a certain orbit or point in space". Chandrayaan-2 had a pretty neat transfer to the moon, it took ...
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### Major topic headings for lunar CubeSat mission design planning?

I am working on a project to design a complete mission for a lunar CubeSat. Assuming that the launch segment is already covered and I need to focus on the spacecraft design. I wanted to know what ...
2k views

### How does a soft landing technically work without air on the moon?

I am curious to know about how rockets or an object lands on the moon when there isn't any air (atmosphere) and the gravity is low.
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### What is the density of supercooled LOX at −206 °C, as SpaceX uses it

I want to calculate the size in cubic meters of Starship's propellant tanks. The only figures for LOX I can find are at −183 °C. 1141.7 kg/m³ at −183 °C. Could somebody please calculate it at −206 °C,...
104 views

### How much did it cost to rush the Apollo program? [closed]

We know how much the Apollo program cost: The United States spent \$28 billion to land men on the Moon between 1960 and 1973, or approximately \$288 billion when adjusted for inflation. Source ...
118 views

### Exactly how does one lope on the Moon?

This answer includes several quotes from apollo astronauts that have walked on the moon. They describe a form of bipedal locomotion they call loping. Question: Exactly how does one lope on the Moon? ...
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### What would be the best course of orbital maneuvers for soft landing an asteroid near the lunar south pole? [duplicate]

Wouldn't it be nice for a colony near the south pole of our Moon to have a nickel-iron asteroid on the surface nearby ! Thousands near-Earth asteroids (NEAs) have been discovered with a diameter up to ...
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### Question about orbital mechanics and trajectories for a space infrastructure project/climate adaption idea

I’m working on an alternate approach to the concept of using a solar shield to shade the earth from the Sun (to help with climate change adaptation). It would use streams of lunar soil from multiple ...
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### What did walking on lunar regolith feel like?

Has the feel of walking on the regolith ever been described? I've heard a description of regolith being like talcum powder (don't remember where I heard that). Since the bulk of regolith has a ...
110 views

### Can pressure fed engines augment Starship's landing on the Moon?

Can a pressure fed engine be powerful enough to augment the landing of Starship on the Moon? How much thrust is needed to land SS if it’s brought to zero velocity at an altitude of 10 meters? A ...
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### Will it be possible for the crewed Orion spacecraft to fly over the lunar south pole to land the VIPER rover there?

Artemis 2, the planned crewed mission of the Orion spacecraft, will be launched in the fourth quarter of 2022 and will then be the first crewed spacecraft to the Moon in 50 years ! VIPER is a lunar ...
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### What is the calculation for the distance VIPER can travel without recharging its batteries?

VIPER, the lunar rover NASA has developed to search for water in the permanently shadowed regions near the south pole of our Moon, will be equipped with (rechargeable) batteries to be able to drive, ...
149 views

### Were flown lunar rover miniature license plates approved for the Apollo-15 flight?

A page in Space Flown Artifacts describes miniature lunar rover license plates that Dave Scott carried to the moon and back: These miniature license plates were manufactured by Boeing (makers of ...
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### Could a framework of mirrors static in space above the Lunar south pole illuminate a moonbase there continuously?

When near the south pole of our Moon a permanent human community is established to search for and produce water in the permanently shadowed regions there, it would be nice to have some light from ...
141 views

### Why only 100 days for VIPER to look for water in the lunar south pole region?

VIPER is a lunar rover by NASA that will be tasked with prospecting for lunar resources, especially water ice, in permanently shadowed areas in the lunar south pole region. It is meant to support the ...
17k views

### Who was the first human to sleep - perchance to dream - on the Moon?

Incidentally I don't mean "on the lunar surface, asleep laying on the surface of the moon" :) So (A) who (if anyone) was the first human to actually be asleep (that is to say, presumably inside the ...
178 views

### An eternal lunar day?

This comment, got posted and I did not understand it. for those interested, one rod per moonhour is about a quarter furlong per fortnight. If I googled correctly and jumped to the right ...
675 views

### How long is a day on the Moon?

I am moving to live on the Moon, I have a solar panel that only makes power when the sun shines on it. I will need to charge batteries to give me power during the lunar night. But I can't figure out ...
219 views

### Why are the poles of the Moon in Google Earth so different from other regions?

I am well aware of the fact that the poles of the Moon are different from the rest of the regions in many ways. But in Google Earth's Moon, the poles are so different from what we would see if we were ...
680 views

### Why is the Duration of Time spent in the Dayside greater than that of the Night side of the Moon for Chandrayaan-2 Orbiter?

The following information is from ISRO's webpage on "Detection of Argon-40 in the lunar exosphere" (Textual information relevant to my question is in bold face): The Chandra’s Atmospheric ...
225 views

### Why can't the VIPER lunar rover recharge its 100-day power source using its solar panels?

Source NASA TechCrunch's NASA’s VIPER lunar rover will hunt water on the Moon in 2022 says: VIPER is a limited-time mission; operating at the poles means there’s no sunlight to harvest with solar ...
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### What would be the temperature range measured 2 meters above the Moon's surface? @10m? @50m? [duplicate]

Were there any temperature measurements experiments done on the Moon where the temperature was measured ABOVE the surface for any period of time?
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### Single Engine versus Multiple Engines for Moon Landing

Does it really make any huge difference in the amount of lunar dust disturbed or raised during a Moon landing while using a single-engine compared to using multiple engines? I do not think there ...
5k views

### Apollo image lighting

How does the lighting in this photo work? It is strange.
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### Would spacecraft rot or degrade over time faster on Mars, on The Moon, or in space?

One question I really wanna ask; do spaceship's rot? If they do degrade, does being on Mars, on The Moon, or in space increase the rotting speed of the spaceship? If so, in which environment would ...
3k views

### Differences between vehicles used on the Moon and the ones used on Mars

What are the differences in design considerations between Moon rovers and Mars rovers?