Questions tagged [lunar-landing]

Questions on the subject of missions to the Lunar surface - past, present, and future

Filter by
Sorted by
Tagged with
7
votes
2answers
386 views

apollo 11 moon landing longitude latitude from PDI to Touchdown

I'm reconstructing the entire apollo 11 mission trajectory. I'm now at the moon landing. Does someone know specific documents specifying longitudes and latitude at the different interfaces starting ...
23
votes
3answers
3k views

What equipment was taken from Earth to the surface of the Moon and back?

During the Apollo missions, basically everything was left behind as soon as it was no longer needed. Of the approximately 45-48 tons that the CSM+LM weighed at launch, only 10% made it back to Earth. ...
2
votes
1answer
81 views

What spacesuits did the Apollo astronauts wear on Earth in their training for the Moon?

Even on the Moon the Apollo spacesuits were so heavy and bulky that the Apollo astronauts couldn't move quite well in them, except in the Apollo 15-17 missions where they were improved. However on ...
27
votes
3answers
3k views

Could the lunar module have moved to a different spot?

Suppose Neil Armstrong had landed with plenty of spare fuel, only to decide it really wasn't a good spot after all. Could he have lifted back off and landed again, perhaps a couple of hundred feet ...
1
vote
0answers
35 views

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 ...
3
votes
2answers
316 views

Could a nuclear thermal rocket take off from the surface of the Moon?

Could a nuclear thermal rocket take off from the surface of the Moon? The application is a shuttle from LEO to the Lunar surface. Fairly recent NASA plans include an NTR LEO to LLO shuttle, but use ...
2
votes
1answer
183 views

Does the Artemis III mission have a backup plan if the astronauts are unable to ascent from the Moon?

For the unlikely scenario where the Artemis III astronauts having landed on the Moon press the ascent button and nothing happens, will NASA have a backup or rescue contingency plan? If so, what ...
6
votes
2answers
194 views

Did the Apollo LM's cockpit altitude displays account for the pointing angle of the radar altimeter?

The Apollo LM had a radar altimeter which was particularly critical in the final stages of landing. It could be set to two different pitch angles, either aimed backwards by 24º to be used during the ...
16
votes
2answers
1k views

Apollo altitude vs rate-of-descent schedule

In the final phase of the Apollo landings, the commander would go into "P66 attitude hold" mode, where the computer maintained a steady rate of descent while allowing the commander to change the ...
2
votes
1answer
82 views

Controlling suicide burn landing location in a python simulation?

I recently asked a question in stackoverflow about Simulation of suicide burn in openai-gym's LunarLander. Sadly most of my assumptions about suicide burn implementaion were wrong but the answer given ...
4
votes
0answers
51 views

Source for Apollo 11 descent time series data?

I'd like to find the state of the Apollo LM at various times during the powered descent phase: its position relative to the Moon's surface and/or the final touchdown point; its attitude in space, and ...
1
vote
0answers
82 views

Model multi-stage lunar transfer on GMAT?

I am new to GMAT, and I am wondering if it is possible to simulate a multi-stage lunar transfer on GMAT? The mission sequence I am hoping to model is a low earth orbit, followed by a trans-lunar ...
0
votes
1answer
119 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 ...
0
votes
1answer
101 views

Could 2 space ships traveling at different time pass through the same space?

This question flows from the recent question Would rocket engine exhaust create pockets of gas in space which could hinder further space exploration? it talks about daily Earth - Moon trips If we ...
4
votes
1answer
120 views

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 ...
43
votes
4answers
12k views

Why is it so hard to land on the Moon?

Successful landings on the Moon happened 50 years ago. Technology (satellites, computer, ML) has come a long way during this time, so why did Israel and India fail recently to land a probe there? Is ...
5
votes
3answers
222 views

Were Soviet plans for a manned lunar landing always lunar orbit rendezvous?

There are three basically three ways to get a person to the moon and back: Direct. One spacecraft launches from Earth, lands on the moon, takes off again, and lands back on Earth. It may shed parts ...
9
votes
2answers
2k views

Why would thermal imaging be used to locate the Chandrayaan-2 lander?

Tweets and news suggest that Chandrayaan-2 lander may have been located, using thermal imaging by the Chandrayaan-2 orbiter. Space.com: India Just Found Its Lost Vikram Lander on the Moon, Still No ...
2
votes
0answers
113 views

What does Cees Bassa's Doppler plot of Chandrayaan 2 show?

Cees Bassa's tweet shows a plot of received frequency versus time, with the Doppler shift of the Moon's center of mass subtracted. For a lunar orbit the resulting plot would show sinusoidal-like ...
16
votes
2answers
5k views

Are there photos of the Apollo LM showing disturbed lunar soil resulting from descent engine exhaust?

Are there any photos of the Apollo LM descent engine bell and the lunar soil beneath it disturbed by the engine exhaust?
7
votes
3answers
362 views

Why do all recent proposed lunar landers have payloads on top?

Every recently-proposed vacuum lander I've seen has its payload as far off the ground as possible. This necessitates cranes, ladders, and elevators to get things down. (Starship may be a partial ...
19
votes
1answer
3k views

How was the cosmonaut of the Soviet moon mission supposed to get back in the return vehicle?

In the Soviet Moon mission, for which the ill fated N-1 launcher was built, we know that the cosmonaut responsible for landing on the moon was to transfer from the equivalent of the command module to ...
5
votes
1answer
188 views

How many different kinds of insulation film are wrapped around the Apollo Lunar Module?

In the image shown in the question Why is the Apollo LM landing gear covered with so much thermal isolation? (also shown below) it appears that the color of the film around the bottoms of the lander's ...
23
votes
2answers
7k views

How did astronauts using rovers tell direction without compasses on the Moon? [duplicate]

I read that the astronauts who used Lunar rovers used heading indicators, which typically use compasses, for direction. How, on the Moon, did their equipment tell the direction of travel, presuming a ...
11
votes
2answers
489 views

Why was the LRV's speed gauge displaying metric units?

In the question Why did NASA use U.S customary units? it was basically stated in the answers that even when metric units were used "internally" (e.g. the AGC), the units presented to the astronauts ...
4
votes
1answer
185 views

Why did NASA sent people to the Moon more than once? [duplicate]

Often, especially now with the 50th anniversary of the Apollo 11 mission, the question is asked: Why did we stop sending people to the moon. The answer is usually: because the USA had proved they ...
32
votes
5answers
6k views

Why were contact sensors put on three of the Lunar Module's four legs? Did they ever bend and stick out sideways?

In the video Brian Eno on Apollo starting at 08:37 there is Apollo-era movie footage of a lunar module taken from the command module as it prepares for descent ...
5
votes
1answer
475 views

How “hard” did Apollo 12 turn left just before it landed?

This answer to How much were the LMs maneuvered to their landing points? includes Figure 34 from Floyd Bennett's 1972 Apollo Experience Report - Mission Planning for Lunar Descent and Ascent; NASA TN ...
7
votes
3answers
542 views

How much were the LMs maneuvered to their landing points?

The story of the Apollo 11 landing includes Armstrong having to fly the LM beyond a boulder field at the automatically targeted site. Was this essentially continuing along the same track the LM had ...
12
votes
2answers
2k views

How were the LM astronauts supported during the moon landing and ascent? What were the max G's on them during these phases?

I understand that the LM astronauts descent trajectory had them flying feet first in a standing position during the descent to the lunar surface and again on ascent. But it seems there must have been ...
2
votes
2answers
99 views

How does the economy of a direct launch (to the Moon) compare with two launches docking in orbit?

How much more efficient would it be to use a launcher big enough to go directly to the surface of the Moon like Apollo did, compared with using two launches with a lesser rocket, say one with the ...
7
votes
2answers
505 views

What's the record for the fastest trip to the Moon?

The line "Therefore the USSR sent detailed instructions to Jodrell Bank how to find their second lunar probe, Luna 2, that was launched on 12 September 1959 and hit the moon the next day." from ...
26
votes
5answers
5k views

What were the problems on the Apollo 11 lunar module?

In the movie First Man we see that there were problems with some button, when Buzz said "We should tell them about that." Also there was an alarm, that they then turned off.
35
votes
1answer
6k views

Why is the ladder of the LM always in the dark side of the LM?

When landed on the moon, the ladder seems to be in the shadow for each Apollo mission. For example, on this photo, the ladder is not in the side exposed to the Sun. (the astronaut go out of the LM in ...
4
votes
1answer
358 views

Chandrayaan-2; time taken to get to the Moon

Depicted above is the print version of the July 02, 2019 Times of India article Why the world keeps returning to Chandamama which nicely surveys the large number of missions to the Moon. India is ...
5
votes
2answers
341 views

Could the Lunar Rover jump start the Lunar Module in an emergency?

In Scott Manley's video Why Lunar Landers Had Jumper Cables For Emergencies he describes the "LOSS OF ED [Explosive Device] SUB-SYSTEM" procedure, which includes the use of a jumper cable called the "...
3
votes
2answers
307 views

How do flags behave on the Moon?

I have seen many theories and question/answers on this site touching upon this subject but no focused question. So I would like to ask this as a two part question. Is what we saw in the Lunar ...
41
votes
2answers
7k views

Was planting UN flag on Moon ever discussed?

In the planning of the US missions to the moon was planting the UN flag ever discussed? It just seems to me that would have been a great public relations move.
1
vote
0answers
49 views

Cost of Lunar base in today's dollars: reference government report about a lunar base written in 2009? [closed]

What would the current cost be? Costs of an International Lunar Base from September 24, 2009 Below is a link: https://www.csis.org/analysis/costs-international-lunar-base
6
votes
1answer
136 views

What would a candle flame look like in low gravity?

We know what the flame of a candle looks like on Earth in 1g and what it looks like in weightlessness. But do we have an idea of what it would look like in Lunar (0.166 g) or Martian (0.38 g) gravity? ...
24
votes
3answers
4k views

Was it really necessary for the Lunar Module to have 2 stages?

We all know the 2 stages LM design used by Grumman was intended to discard the mass of the landing gear (+ other components) at the moment of launching off the Moon surface to reach back the Service ...
3
votes
2answers
2k views

Can we see the USA flag on the Moon from Earth? [duplicate]

Is it possible one day to see landing site flags on the Moon from Earth or from space without having to land using a telescope as technology progresses? Highly Related: Were the Apollo lunar ...
21
votes
1answer
6k views

ELI5: Why do they say that Israel would have been the fourth country to land a spacecraft on the Moon and why do they call it low cost?

In the news they say that Israel hoped to become the fourth country to land a spacecraft on the Moon. Only government space agencies from the former Soviet Union, the US and China have made ...
6
votes
3answers
221 views

What propulsion system would not pollute the surface when landing on a pristine celestial body?

A robotic lander on a science mission, especially to an airless body, would like to avoid disturbing the surface it is landing on with rocket exhausts. MSL Curiosity used a Sky Crane to somewhat ...
2
votes
1answer
211 views

Moon Polar Days And Night

Moon's rotation axis from the orbit plane of earth is about 1.54° tilted. Just like earth because of tilt, do polar regions experience 6 months day and 6 months night? If so, aren't these places ...
1
vote
1answer
177 views

How did Chang'e-4 hover, rotate, and then descend so gracefully? (Video)

In this incredible video we can see Chang'e-4 in it's final approach and landing on the moon from the point of view of the spacecraft. The view is horizontal as the spacecraft seems to stop and hover ...
2
votes
3answers
244 views

Why are the rovers finding the long Lunar night difficult to overcome?

Compared to Martian nights, Lunar nights are long and cold. This has posed a lot of challenges in the past. What specific challenges does long duration night pose? What are the methods to over come? ...
2
votes
0answers
43 views

Direct transfers to inclined lunar orbits?

I'm trying to find examples of direct earth–moon trajectories ending in inclined low lunar orbits. I've found a few classes, such as those with plane changes between SOI encounter and capture ...
9
votes
4answers
2k views

Exit film of moon landing departure

On Apollo 15, 16, and 17 NASA filmed the Lunar Module taking off and leaving the moon. With no-one on the moon how could the the camera move to follow it and who brought the exposed film back to ...
11
votes
1answer
2k views

Was there fuel consumption budgeting for Apollo 11 Lunar module?

Did the astronauts aboard Apollo 11's Lunar Module have any stated or imposed limitation or restriction on the amount of fuel they could use while in lunar orbit and performing landing maneuvers? I am ...