Questions tagged [lunar-landing]

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

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How big are the risks of Starship flipping during or after landing on the Moon?

Now that NASA has announced the selection of SpaceX to manufacture the Moon landing vehicle(s) for the Artemis program, I can't but notice how tall Starship is when compared to other concepts. Chances ...
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Falcon 9 vs Apollo Landing: Key Differences?

So I'm struggling to model a Falcon 9 vertical landing. And because Falcon 9 info is scarce, I'm looking for more public info sources---like the apollo missions. The Apollos did basically vertical ...
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What are SpaceX plans for Starship with respect to Moon landing and then takeoff?

Starship uses Raptor engines which in turn uses liquid methane as fuel. The idea for using methane as fuel being - methane can be produced on Mars from CO2 and H2O. And using the onsite produced ...
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How likely is it for Chang'e 5 to wake up after lunar night?

I have been wondering how likely it would be for the Chang'e 5 Probe to wake up. I mean the surveyors did this a few times, but were all relatively simpler in design. Also what gets damaged in the ...
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What is the danger of creating micrometeorite clouds orbiting the Moon by constantly landing spacecrafts on its surface?

It is a well-known fact that when meteorite hits surface of the Moon, a part of debris can end up on Earth because the escape velocity for Moon is low - 2.38km/s. A similar effect can be achieved by ...
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Lunar landing in cotton candy?

When spacecraft land on Earth, they use the atmosphere to slow down. On the Moon there's no atmosphere, so spacecraft must instead use rockets to slow down from orbital velocity. Would it be possible ...
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Is there really microfilm on the Moon?

A comment below this answer to Disc mounted on lunar rover? suggests that ...a number of documented microfilms that were on the Apollo missions. meaning I presume that bits of microfilm were ...
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What is the inclination limit for Artemis landings?

Inspired by Did any of the Apollo lunar modules land significantly off level? I'd like to know if there is an inclination limit for the Artemis Human Landing System?
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What was the nature of the communication problems during Apollo 11's Eagle's descent? How were other antennas selected?

In the video of Los Angeles station KTLA's Frank Buckley interviewing astronaut & Apollo 11 CAPCOM Charlie Duke a communication problem and antenna selection is described: BUCKLEY: Many of us who ...
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Procedure to deal with the death of Apollo astronaut during a lunar mission

During Apollo lunar missions, had the command module pilot have died while the other two astronauts were on the Moon, or had only one of the two lunar walkers died, did NASA have a procedure for such ...
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Why did Apollo 11 land at the sea of tranquility?

As we all know in 1969 Apollo 11 landing made history but, why did it land specifically at the sea of tranquility also known as Mare Tranquilitatis. Probably they would have chosen this because of ...
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Did NASA develop any crewed moon landing programs between Apollo and Constellation?

I just assumed that NASA has always been developing some plan to get humans back on the moon since Apollo was cancelled. But while attempting to verify this, I found that this doesn't seem to be the ...
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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 ...
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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. ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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221 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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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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.
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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 ...
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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 ...
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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 "...
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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 ...
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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.