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Questions tagged [the-moon]

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

173
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6answers
14k views

Can I borrow a lunar rover?

According to Wikipedia there are 3 LRVs sitting on the moon, in very well defined locations. Would China, or whomever gets to the moon with a person next, be able to get in and drive around in an LRV ...
37
votes
5answers
2k views

How do we know the Apollo Moon landings are real?

Since about 1976, conspiracy theories denying the Moon landing and claiming it was all faked have cropped up. As a website devoted to answering questions about space exploration, we receive questions ...
7
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2answers
2k views

Can five refillings of the BFR second stage be useful to get to the Moon? To Mars? All five in Earth orbit?

EDIT: Here are some BF numbers from the video: ...
93
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3answers
74k views

How did NASA achieve their live TV broadcast in 1969?

In 1969, NASA not only went to the moon, but broadcast the whole thing live on TV. How did they achieve the TV broadcast? What technology did they need to use to send a video and audio signal from ...
23
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1answer
7k views

Which artificial satellites in lunar orbit are currently active?

Most of artificial satellites of the Moon has depleted their batteries, lost communication, been deorbited or impacted the surface after orbital decay. The list doesn't exactly make it clear which ...
21
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1answer
2k views

How was dust-mitigation addressed during the Apollo program?

Dust mitigation in the context of manned landings is now a rather vital topic of research and testing, but back in the days of Apollo it was a fairly new problem. 'Dusty' Gene Cernan inside the LM ...
4
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0answers
165 views

How will the Lunar Gateway go to L2 and L1?

In a talk to the press which can be heard in the YouTube video NASA Administrator Jim Bridenstine Explains the Lunar Gateway, NASA director Jim Bridenstine says after about ...
2
votes
1answer
120 views

Which perturbs LEO satellites more, the Moon's gravity directly, or the changes in Earth's gravity field due to the Moon?

Reading this tutorial answer on models of Earth's gravity field I was realized that I'd never thought of it as time dependent. According to it, the biggest short term changes in the shape of Earth's ...
24
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7answers
17k views

How far can you fall on the Moon without injury?

In the book "The Gods Themselves", Isaac Asimov imagines humans living on the Moon would enjoy much greater freedom of movement on the Moon. Each pair went up in unison; each pair rose and fell in ...
11
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1answer
1k views

What does the BackFlip lunar cycler do in its pass by Earth?

This paper describes an Earth-moon cycler orbit. In this concept, a 180 degree "BackFlip" is used to modify a more simple cycler orbit. However, I can't figure out what cycler orbit it modifies, and ...
15
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2answers
840 views

What is the deepest position in space we can get a GPS signal?

Can we use GPS in orbit at the moon? What about on Mars?
9
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1answer
1k views

Is a lunar Sun-synchronous orbit possible at the “frozen” inclination of 86°?

I have been considering if it would be possible to place a satellite in a Sun-synchronous orbit in one of the lunar frozen orbits at 86°. According to NASA scientists there are four inclinations for ...
6
votes
2answers
564 views

What actually happened here with a satellite, the ISS and the moon?

I can't follow exactly what happened from this string of tweets - I'm not really twitter-literate. It seems like there was a predicted conjunction of the ISS with the moon, and an actual video of what ...
18
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2answers
3k views

What is the marginal cost of *landing* on the Moon?

The question How useful is placing an asteroid in the Moon's orbit? quotes a news article saying the Obama administration is opposed to a lunar landing mission because of the cost of such a mission: ...
30
votes
2answers
15k views

Would it have been possible to have sent the Space Shuttle around the Moon?

I'm curious about whether or not the Space Shuttle could have been used as a lunar orbit vehicle - basically, would have it been technically capable of getting to the Moon, entering orbit, then ...
27
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1answer
5k views

How did the Apollo 11's Eagle ascent stage find the CSM after leaving the Moon?

I've always been curious how did the Apollo 11's Eagle ascent stage of the Apollo Lunar Module navigate back to the Apollo Command/Service Module (CSM) that was in lunar orbit? Was it simply a case ...
21
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4answers
2k views

Can you buy land on the moon?

The two primary documents regarding legal niceties on the Moon and often mentioned are: Outer Space Treaty of 1967, which according to Wikipedia is essentially ratified by any country with a chance ...
24
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3answers
10k views

What did the sky actually look like from the Moon?

All the photographs I've seen from the Apollo missions show lunar features in good detail and exposure. This of course means that the shutter is not open long enough for light from stars to develop on ...
20
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3answers
15k views

Why is the Far Side of the Moon so different from the Near Side?

Here's a photo of the Far Side of the Moon Compare that to the Near Side: Why the difference between the two? The difference is quite significant.
15
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2answers
7k views

How to calculate Delta V for lunar flyby

As I understand the idea of a lunar flyby, you can pass a spacecraft by the far side of the moon without having to burn fuel to decrease your momentum and get to LLO (Low Lunar Orbit). But it seems ...
10
votes
3answers
650 views

Could lunar mining be used to service Low Earth Orbit?

What would be the major hurdles of setting up an autonomous mining operation on the Moon to shoot lunar rock to something like the ISS? I would think it would be a much easier way to get radiation ...
7
votes
1answer
373 views

How much power loss does the LLCD suffer in transit?

Space.com writes to say (freeform improved quote): The LLCD (Lunar Laser Communication Demonstration) space terminal is designed to beam data from the moon at a rate six times faster than the best ...
19
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4answers
4k views

Has Luna been used for gravity assist for interplanetary probes?

The Earth's natural satellite has a great deal of angular momentum that seems to me could be used to derive a considerable boost for leaving the local SOI. Has any probe used a Lunar flyby as part of ...
16
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5answers
3k views

Would a lunar telescope provide a significant improvement over terrestrial based equipment?

As I understand it, the moon makes for an ideal location for a telescope because it offers environmental factors that are unlike anything achievable on earth: A lack of atmosphere, light pollution, ...
13
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1answer
2k views

What is the average electrical charge on the lunar surface?

Known facts: The lunar surface is covered by regolith. The Solar wind imparts a charge to the lunar surface Wikipedia says On the daylit side of the Moon, solar ultraviolet and X-ray radiation ...
6
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2answers
2k views

How is the Moon's coordinate system defined?

In the Apollo 17 Wikipedia article, the coordinates of the descent stage are given: 20.19080°N 30.77168°E. What are the specifics of the Moon's coordinate system? Where is 0°?
3
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1answer
114 views

Shape and dimensions of the Moon's reference surface for selenographic latitude/longitude?

For Earth, the reference surface for "GPS" latitude, longitude, and altitude is the WGS84 ellipsoid, with equatorial and polar radii $a, b$ of 6378.1370 and 6356.7523 kilometers, respectively. ...
21
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1answer
3k views

Were the Apollo 11 astronauts aware of any parts of the Luna 15 mission?

I just learned today about the Luna 15 mission which was a Soviet attempt to land an unmanned probe on the moon which coincided with the successful Apollo 11 mission. Were the Apollo 11 astronauts ...
8
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2answers
2k views

How feasible would it be to move the ISS to the surface of the Moon to recycle its components in future?

I see it as an awful waste of energy in not only creating the International Space Station (ISS) components, but also in getting them into space to only decommission the station by letting it fall back ...
6
votes
2answers
802 views

What is the main problem of Luna's base? Why is there a 3rd generation of orbital bases and no Luna base? [closed]

Orbital stations going to 3rd generation. China starting its own program. Russians MIR (world) was flooded in the ocean. Humanity has lived in space for half of century. But there is still no moon ...
5
votes
1answer
904 views

Lunar astronauts and freezing temperatures

How do astronauts walking on the moon keep their waste body fluids from freezing in the extremely cold environment? I understand that if they need to release waste body fluids, they do so into ...
3
votes
1answer
507 views

Could “Asteroid Redirect” make the moon more dangerous for astronauts for a long time?

The proposed Asteroid Redirect Mission would capture a small astroid, then tow it back to the moon and place it in orbit - in a bag - if I understand correctly. I'm all for creative thinking applied ...
1
vote
1answer
243 views

Why doesn't a full/gibbous moon high in the sky ever seem to look orange? Shouldn't it? [closed]

The question Why does the Moon appear gray when passing between the Sun and the Earth? shows the famous "Moon photobombs Earth" image of the moon in front of the Earth taken from the EPIC camera on ...
30
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3answers
6k views

Could the Moon keep an atmosphere?

When we think of terraforming a body in our galaxy Mars gets lots of consideration as the closest potential body. But what about the Moon? It is currently beyond our ability to add an atmosphere ...
18
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2answers
2k views

Is it possible to have an orbit around the earth and the moon

I was just wondering if it were possible to A) Orbit the moon and earth B) To orbit any two celestial bodies really?
16
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4answers
1k views

Is current state-of-the-art additive manufacturing (aka 3D printing) good enough to build parts out of Moon/Mars dust?

Additive manufacturing is currently being proposed as a way to greatly decrease the cost of establishing a permanent (robotic or human) presence on the Moon or Mars by sending only 3D printers to ...
21
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4answers
1k views

Could a spacecraft be made out of lunar materials?

Would it be possible to construct a working spacecraft using only materials extracted from the lunar surface? If not, what materials would we have to be ferried from Earth for this purpose?
20
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2answers
2k views

How fast could a person run on the Moon?

Measures of the vertical and horizontal vectors of athletes running shows that once they get up to speed the ratio of vertical to horizontal exertion is about 4:1. This paper by Jean-Benoit Morin Ph.D....
14
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2answers
3k views

Were stereoscopic pictures taken during the Apollo missions?

Were stereoscopic pictures taken during the Apollo missions? Did the astronauts of the Apollo 11, 12, 14-17 take stereoscopic pictures of the lunar landscape? I know many stereoscopic images were ...
11
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2answers
1k views

Picture of equipment left on the Moon?

When people visited the Moon, they left sizeable items behind. I know that taking picture of this from Earth is incredibly hard, but: Did someone try? And what pictures do we have?
10
votes
1answer
784 views

Low Energy Transfer within Earth-Moon system

Practical aspects of a total low energy transfer to the Moon have been seen in missions like GENESIS, which uses Weak stability Boundary legs of Earth and Sun to reach ESL-2. This four body model ...
8
votes
1answer
768 views

Constant lunar sub-surface temperature

On Earth we have the idea of constant ground temperature. Builders in North America think of it as 55 degrees at 5 feet down (not quite true, but close enough). At the surface it varies with the day. ...
5
votes
1answer
286 views

What payloads and launch speeds could a sling launcher get using modern materials on the Moon?

The only reference paper I have found on this subject is this paper by Landis, which is a great introduction to sling launchers - but the concept has been around for some time and there must be other ...
27
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3answers
2k views

What happens to defunct lunar and Mars rovers? What technological barriers prevent humanity from creating a perpetual rover?

What happens to defunct lunar and Mars rovers? What technological barriers prevent humanity from creating a perpetual rover with sun batteries or nuclear portable reactors for use on Mars, the Moon, ...
15
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5answers
2k views

Would Luna 15 have been visible to any of the members of the Apollo 11 crew?

According to Wikipedia, Luna 15 crashed a few hours before Eagle lifted off from the moon, and since it crashed North-east of the landing site, it must have overflown them. Would any of the crew have ...
14
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3answers
886 views

How useful is placing an asteroid in Lunar orbit?

Quoting from NASA warned plan to send humans to Mars may fail news article: The Obama administration is opposed to another moon landing, saying such a mission would be too costly. It wants ...
12
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3answers
1k views

How do space suits offer heat protection i.e. during the lunar day?

I didn't know that during lunar day temperature is up to +100°C. This would mean US astronauts were rather to protect against heat than cold? How was this solved (normally, space suits protect from ...
6
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3answers
399 views

Could a (differently) inclined orbit remain above a Lunar pole half of every revolution?

Let's say that we want constant communication between the Lunar north pole and Earth. The 5.145° orbital inclination of the Moon means that the (mountain at) the Lunar north pole will have line-of-...
5
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2answers
3k views

How could a trip to Mars benefit from a “Distant (Lunar) Retrograde Orbit” DRO?

This guest blog text by Martin Elvis mentions a kind of orbit which I've never heard of before. How does the orbital mechanics work so that a DRO could benefit an interplanetary mission? ... ...
3
votes
1answer
477 views

How does Exploration Mission 1 orbit differ from Apollo-era free-return? How far from Earth (and Moon) does it go?

I'm having trouble understanding the current orbit planned for NASA's Space Launch System's Exploration Mission 1. Is it possible to explain how the planned orbit works and what the maximum distance ...