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2answers
109 views

Mercury reentry heat shields; material composition, manufacturing process and explanation of all those concentric ridges?

A collection of photos in posts by Miles Lumbard there is a page titled Mercury Retro Pack Walk Around Page 1 (spotted here in reference to the thermal zebra stripes) can be found nine images with the ...
1
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0answers
30 views

Orbital Insertion Altitude for Rendevous with ISS

When SpaceX launches a CRS mission to the ISS, what altitude do they target at orbital insertion? If the ISS is 400 km above ground, do they target 400 km at SECO? Or do they target a lower number---...
1
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0answers
22 views

How does one go about naming a lunar crater? [migrated]

Suppose I discover an uncatalogued crater on the lunar surface, and decide to name it. How would I submit my proposed name to the IAU?
2
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0answers
32 views

Avoiding Martian contamination with Earth microbes

Unmanned probes can be sterilized, but when humans begin occupying Mars in large quantities, how can contamination of possible Martian microbes with Earth microbes be avoided?
3
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2answers
96 views

Cryogenic storage in Starship header tanks

Since Starship uses cold liquid oxygen and methane fuel in its header tanks, how will these cryogenic tanks been kept full and cold on long missions in space?
1
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3answers
182 views

How to make a model rocket that doesn't spin?

I'm attempting to build a rocket with 8 fins (four on bottom and four smaller ones towards the top). The four fins near to the top will be attached to servo motors and programmed to stabilize or guide ...
1
vote
2answers
216 views

Can the Space Shuttle land on Mars assuming there is a paved surface for landing?

Can the Space Shuttle land on Mars if it had a paved runway? Can the Space Shuttle use aerobraking and will its control surfaces provide attitude control? Can the parachute and braking systems stop ...
6
votes
1answer
118 views

Soviet Luna 16 Spacecraft

Is the Soviet spacecraft Luna 16 still working and transmitting temperature & radiation levels? Attempts to Google the results of Luna 16 have failed, possibly because the results are in Russian.
3
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1answer
102 views

Rocket dashboard: separation/pyro indicators

I'm curious about rocket dashboards. Separation events are big things and they depend on pyro bolts detonating and linear charges or pneumatic pushers firing immediately afterward. There must be ...
0
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0answers
62 views

Has Made in Space any track record growing specialty crystals in microgravity before? (“Industrial Crystal Facility” to fly this year)

Ars Technica's There are an insane amount of cool space things happening in 2021 mentions: This year, Made in Space's "Industrial Crystal Facility" should also fly to space. This will serve ...
2
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1answer
96 views

How can you calculate a course based on constant acceleration burn and deceleration burn?

In the TV series The Expanse, a sci-fi space-engine called the "Epstein Fusion Drive" is a thruster capable of performing constant acceleration (up to and beyond "20g" (about $200 ...
2
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1answer
46 views

How important is the convergence angle of a liquid bipropellant rocket engine

So I can't exactly find out what angle should the converging part of the rocket chamber be or why different angles are chosen for engines (varies by about 15°). Are there any guidlines on the angle or ...
2
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0answers
54 views

What is more promising: the development of nuclear space tugs (Roskosmos, etc.) or the improvement of existing ones? [closed]

There are a lot of things in space now that require the use of space tugs. Many companies are developing their space tugs. For several years there has been talk of a nuclear space tug. Are all these ...
6
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0answers
88 views

What ever happened to 6Q0B44E - potentially the “artificial satellite (with) the farthest orbit around the Earth”?

I just started flipping through Handbook of Space Engineering Archaeology, and Heritage Space Hardware Ann Darrin & Beth L. O'Leary, Eds. 2009, CRC Press, Boca Raton, 1035 pages It looks as though ...
-2
votes
1answer
88 views

Is there a widespread popular misconception of how expensive it is to launch a cubesat? [closed]

Sometimes one sees discussions about hypothetical CubeSats with impressive abilities that seem to be assume that CubeSats are cheaper to launch (not merely individually, but by mass) than larger ...
4
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1answer
76 views

What are the Basics of CubeSat Power Supplies and Systems?

I am going to go ahead and apologize for my ignorance surrounding this topic, as my background is Aerodynamics, and not Electrical Engineering. From what I understand, CubeSats typically generate ...
2
votes
1answer
68 views

Surface processes of the valleys on Mars

I have two related questions about geophysical processes related to talus* fans on Mars: How were talus fans on Mars formed? (like Valles Marineris or Kasei Valles) What is the role of these fans or ...
1
vote
1answer
88 views

Pee processing in space

Do astronauts drink each their own pee or is there a common pee container where all pee get collected and processed? It's clear to me that the obtained water must be sterile, but even then, I imagine ...
2
votes
1answer
129 views

Gimbal Check: Before or After Engine Ignition?

Is the engine gimbal check done before or after ignition? Also curious: How many seconds does the check take? What does it consist of? Do they gimbal each engine separately, or do they gimbal all ...
16
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4answers
6k views

What was the “5 minute EVA”? What was the shortest-duration EVA ever?

A comment to this answer makes the claim humans are so impaired in space that their ability to repair anything is ridiculously low (hours of preparation and debriefing even for a five-minute EVA, and ...
1
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1answer
124 views

Is space habitation a technology problem or is it really just a mass (cost) problem?

There are a lot of challenges with space habitation. Gravity, radiation, fuel for reactions to maneuver, water, atmosphere, food, etc. etc. NASA and many others are working on all kinds of solutions ...
2
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2answers
117 views

How many sun sensors are required to find a cubesat's orientation

I have read how a sun sensor can help find the orientation of a spacecraft, but I wasn’t sure how many are required, e.g. if one is needed on each face of the Cubesat. (Any additional information is ...
0
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0answers
30 views

If I know the masses, positions, and velocities of two objects, how do I calculate their trajectories under gravity?

I was thinking about the effect of a near-miss with an asteroid upon the orbit of the earth around the Sun. My goal is to figure out a formula I could use for a visualization I'd like to build to get ...
2
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0answers
44 views

Calculating the length of a launch window?

May somebody guide me what exactly determines the length of a launch window? When doing the (basic) celestrial mechanics caclulations for e.g. a transit from Earth to Venus, one usually assumes point-...
2
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0answers
28 views

Does the displacement angle change after burnout?

I came across the above image on Nakka's page about fins and what I understood is that rockets will turn into the wind during the thrust phase, and will drift slightly with the wind after burnout. But ...
5
votes
1answer
65 views

Satellites Orbital Parameters

I want to access satellites' orbital parameters like inclination, right ascension of ascending node and argument of perigee. Unfortunately, I haven't been able to find this information. Is there a ...
2
votes
3answers
165 views

Bucket loop between Earth and Moon?

Please don't bite my head off. If this is so stupid that it deserves to be squashed, I'm quite happy to delete the question. I mainly would like to know whether anyone's ever suggested this (I ...
1
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0answers
18 views

How many cubesat U's is CAPSTONE really?

Wikipedia sez: The orbiter is a 12-unit CubeSat but looking at the images in the new NASA video NASA 2021: Let's Go to the Moon I see artwork that shows Capstone as a square-based prism with the ...
4
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1answer
84 views

Besides landing several folks on the Moon and returning them safely to the Earth what criteria did Human Landing System proposals to NASA meet?

The new NASA video NASA 2021: Let's Go to the Moon shows artwork for three very different spacecraft sitting on the lunar surface with the overlain caption Selecting A Human Landing System "...
1
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0answers
64 views

Technological challenges to sending a high altitude balloon to space and orbit from 50 km?

Below At what altitude would I have to go in a lighter than air balloon to be above all wind and just have the earth rotate underneath me? there is a comment: If you want to be above all winds, you ...
6
votes
1answer
112 views

Was the nature of Explorer 3's orbit intentional?

A number of early spacecraft launched into orbits other than the intended one. For example, Explorer 1's apogee of 2550 km was much higher than intended, and Vostok 1's was too high to decay in the ...
3
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1answer
97 views

Why are some rockets painted black? [duplicate]

Why are Rocket Lab's and other rockets painted Black? Shouldn't they be painted white to reflect most light and therefore absorb less heat from sunlight?
2
votes
1answer
60 views

How does one determine the optimal CH4:O2 ratio in a methane-LOX rocket engine?

The SpaceX Raptor uses a 78:22 O2:CH4 ratio. It also has combustion chamber pressures higher than any other rocket engine ever built. My questions are: What's the math / chemistry that determines ...
12
votes
2answers
2k views

Using a fidget spinner to rotate in outer space

There is a question How do astronauts turn in space?, and related questions here and on physics.stackexchange, that detail how astronauts might maneuver by spinning their upper and lower body ...
4
votes
1answer
134 views

Is it really possible to catch the Super heavy booster by using the launch tower ? How Challenging will it be?

Reports say that SpaceX now aims to recover the Super heavy booster by catching it with the help of the launch tower. What are the engineering challenges for this and how will it benefit ? News ...
2
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2answers
81 views

Average acceleration of a rocket given average mass and thrust

If we assume that a small scale rocket is launched perpendicularly to the ground and ignore the drag, how can I calculate the average acceleration given that I know the burn time, the average thrust, ...
2
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0answers
26 views

Direction of heliocentric entry velocity for fly-by coming from interplanetary Hohmann transfer?

I'm following Curtis's equation on interplanetary transfers. I'm confused by the direction of the entry Heliocentric velocity for a fly-by. If the assumptions is that orbits are: Coplanar, cofocal ...
5
votes
0answers
140 views

Is the SETI's `needle-sharp at 982.002 megahertz` signal accessible? [migrated]

In April-May 2019, the Parkes radio telescope, in Australia, received a weird signal while surveying Proxima Centauri. Is this signal available, ideally in some digitalized form? Where could I ...
12
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11answers
3k views

Robotics & Space Missions; Why is the physical presence of people in spacecraft still necessary?

Robotics is now well developed. Many programming languages allow you to work in real-time. Also, a new era of space missions and research is in full swing. So here's the question: Why is the physical ...
5
votes
1answer
96 views

How many Soviet space missions have had at least one tortoise?

Science Alert's These Are 7 of The Strangest Experiments Humans Have Ever Done in Space talks about two tortoises that flew aboard Zond-5 spacecraft on 2 September 1968, then later goes on to say: We'...
2
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1answer
44 views

Payload Capacity definition

Does the payload capacity of a rocket include the satellite and the adaptator or is it just the satellite ?
4
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0answers
70 views

Number of nonhuman primates dead in space exploration

This statue, "Sam", in Riga, Latvia, is dedicated to the animal cosmonauts who perished during space flight experiments. As far as I know, there were a lot of dead dogs on space flights, ...
3
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0answers
82 views

JAXA/NASA astronauts on a Shuttle mission; was it like dual citizenship/joint appointment or did one agency take precedent?

Professor and former astronaut Takao Doi does many things, including being a Space Shuttle mission specialist, an amateur astronomer and discoverer of two supernovae 2002gw IN NGC 922 and Supernova ...
2
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0answers
42 views

Do black holes emit enough heat to heat a planet? [closed]

Under what circumstances can a blackhole emit enough heat to allow life on an orbiting planet?
2
votes
1answer
62 views

Can Starship use dedicated smaller auxiliary landing fuel tanks?

Would it be better for Starship to have a separate set of small fuel tanks dedicated to landing the ship, maybe controlled separately or plumbed differently.
2
votes
2answers
78 views

How many times is a single rocket engine tested?

When a rocket engine is loaded into a test stand is it tested once before removal or is it allowed to cool and then tested again. Is every liquid-fueled rocket motor that flies to space first tested ...
3
votes
0answers
21 views

Did Starlink's experimental Darksat help reduce brightness? [duplicate]

Did Darksat's visor like coverings to its parabolic antennas reduce the brightness or was it a failure. Or is SpaceX devoleping any other mechanisms or manuveres to counter this problem?
6
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2answers
167 views

How many time-zone does the ISS cross through during one orbit?

A recent non-answer to an unrelated question stated that the ISS crosses 16 time zones during New Year's Eve, which is obviously incorrect, the actual answer being "around 200". But this ...
6
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0answers
57 views

Eyes on Mars; are these craters mentioned or described in any paper or (scientific) article?

Credit: NASA/JPL/University of Arizona HiRISE ESP_025334_2035 For a closer view, click on the image, and then, click again. This pair of similar craters is located in the northern part of Oyama crater,...
7
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1answer
64 views

What benefit do the aerodynamic stabilization “pods” on the PSLV-CA provide?

Whilst writing this answer about the PSLV, on this informative page about its Secondary Injection Thrust Vector Control system, this image (cropped) is displayed, showing that for the Core Alone ...

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