All Questions

5
votes
2answers
98 views

Does adding a nozzle increase peak pressure in a rocket?

If I had two charges of the same solid propellant both in the same geometry and casing, and added a de laval nozzle to one, while the other would have just a simple hole for an exhaust, upon firing, ...
7
votes
1answer
148 views

How do astronauts get eye drops into their eyes?

This answer mentions that some astronauts use eye drops to relieve irritation caused by dust and lint in the air. How do they do get the drops in their eyes in microgravity? When I put drops in my ...
1
vote
2answers
185 views
+100

Will the real Snoopy please stand up?${}^†$ Has the candidate object for Apollo 10 lunar module been publicly identified?

This tweet seems to suggest that the details will be released only after a mission is planned and funder, or at least $50 million is put in escrow, or a bitcoin wallet is offered, but I am not sure I ...
0
votes
0answers
35 views

Have nuclear reactors been used in space [duplicate]

Have nuclear reactors ever been used in space as a way for power, instead of solar panels? If not, have any plans for one ever been made?
-2
votes
0answers
46 views

Space Based Solar Power

Are there any US-based companies who are solely developing Solar Power Satellites? Google search turns up scarce information.
1
vote
0answers
43 views

Would it be possible to de-orbit a small object by throwing it with human strength? [duplicate]

If an astronaut went on a spacewalk (say from the ISS), tethered him/herself to a relatively massive object in orbit around the earth (say the ISS), and threw a small object in the direction opposite ...
4
votes
0answers
49 views

Explanation of single-burn trajectories from Lunar surface to Earth surface

I learned of the fine book Soviet Robots in the Solar System from this excellent answer. One chapter in it describes how the Soviets had extreme mass limitations on their lunar sample return vehicle ...
2
votes
0answers
57 views
+100

How to use “patch points” to make a continuous halo orbit?

update: I've found "patch points" mentioned throughout the following papers; it is likely that an answer can be found from these sources. Targeting Cislunar Near Rectilinear Halo Orbits for Human ...
3
votes
0answers
43 views

Is the Gateway's halo orbit bound to Earth? Would the Gateway remain in Earth orbit of the Moon disappeared?

Discussion below this answer involves my feeling that calling halo orbits in very asymmetric systems (e.g. Sun-Earth or Earth-Moon) as orbits around the primary, in 1:1 resonance with the secondary. ...
3
votes
1answer
96 views

Aspects of “true deep space environment” on Gateway not thoroughly explored by decades of habitation of nine space stations already?

The ABC News article President Trump prompts state of confusion over space policy with tweet covers POTUS' tweet and NASA director Bridenstine's clarification tweet a few hours later, as well as cites ...
2
votes
0answers
42 views

What is the orientation of ionizing radiation exposure in spaceflight?

It strikes me that, outside of the Jovian system for the most part, the orientation of ionizing radiation exposure is entirely sunward. Thus, if you park a large enough shield between the sun and a ...
2
votes
0answers
41 views

What's the point/area of space called where there is equilibrium between 2+ different gravitational forces?

For some reason I want to call it a 'gravity well' but I know that a gravity well is just the gravitational force distribution in space due to an object with mass. But regarding my question, isn't ...
2
votes
1answer
90 views

How does an onboard atomic clock help interplanetary navigation?

On 2019 June 22, JPL will launch and test the accuracy of an onboard atomic clock. Its FAQ says that it will improve interplanetary navigation because for the ship to determine its position, instead ...
9
votes
1answer
1k views

How was the airlock installed on the Space Shuttle mid deck?

I just finished the Haynes manual on the Space Shuttle, and it mentions that on some missions, an airlock was carried on the mid-deck area. I'm more familiar with the airlock carried in the payload ...
1
vote
1answer
57 views

Non-biological end effectors (hands) in spacesuit design

Designing the 'end effectors' or gloves of a spacesuit is notoriously difficult. Hands have are extremely flexible and are the primary interface that humans use to interact physically with the world. ...
4
votes
0answers
46 views

Concepts for interior color of interplanetary manned spacecraft

I believe I once saw a documentary of NASA examining concepts for future, interplanetary manned spacecraft. I thought the discussion included studying the interior colors, and the importance of ...
4
votes
3answers
174 views

Would a standard gravity turn still be the most optimal path to orbit if Earth did not have an atmosphere?

If Earth had no atmosphere, then would a standard gravity turn still be the most optimal path to orbit? Why or why not?
1
vote
0answers
24 views

Does energy created from the crews mandatory exercise get used for powering parts of the ship [duplicate]

As the question states, I am wondering if energy created from for example a cycling machine get used for anything?
2
votes
0answers
73 views

Is the nosecone of the CST-100 Starliner more than structural?

The CST-100 Starliner is Boeing's new crew capsule. It has a detachable nosecone which serves several structural purposes. Because the capsule uses a pusher-style launch escape system, there is no ...
5
votes
1answer
714 views

How precise must a satellite's orbit be?

I was thinking about the question on solid upper-stages and my feeling that a liquid upper-stage would allow a more precise orbit. But... how precise does an orbit actually have to be? I guess I mean ...
9
votes
0answers
79 views

Detailed information about the Soyuz descent module connection box?

Anyone have some detailed information about how all this connectors, located in the soyuz descent module? Are they used only when they setup the Soyuz or they are ...
5
votes
1answer
89 views

Reference to understand the notation of orbital charts

To address various orbital evolutions of spacecrafts, some particular orbital charts are taken into account. For example, the following is used to depict how a chaser reaches a target: The only thing ...
35
votes
1answer
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.
7
votes
3answers
166 views

What tensile strength would be needed for a lunar space elevator?

A space elevator from the Moon's equator, slightly past the L1 Lagrange point and extending into cis-lunar space would have a substantially lower tensile strength requirement than an Earth-based ...
-1
votes
1answer
78 views

what would happen to an ohio Class nuclear sub if it was launched into Space [duplicate]

Years ago I read a neat Syfi Book about a special warp phase engine that was thrown into a sub and used for space travel..I also grew up Watching Star Blazers.. lets say a late model Nuclear Sub was ...
5
votes
0answers
106 views

What language is the Russian segment ISS software written in?

I have heard that the ISS uses a Russian coding language for some of the systems and subsystems on the Russian segment of the ISS. What is that coding language?
3
votes
3answers
449 views

UTC timestamp format for launch vehicles

Has anyone ever seen UTC timestamps of the format xxx:HH:mm:ss.sss? What are the three x's at the front. For reference, this timestamp belongs to an upcoming launch in June of 2019.
2
votes
1answer
54 views

How quick was the solar wind particle decrease detected by Voyager 1?

In the graph below, does each dot represent the passage of six hours? If so, does that mean the last dramatic decrease in solar wind particles, from ≈24 particles/sec to ≈10 particles/sec occurred ...
4
votes
1answer
114 views

Sulphur Hexafluoride atmosphere for Ceres?

So, I have read that the escape velocity of Ceres is 514 m/s, and orbital velocity(for a low orbit) is 360 m/s... Now, the RMS(Root Mean Square) velocity of Sulphur Hexafluoride at 72 $^o$F (23 $^o$C,...
2
votes
0answers
67 views

What is the largest energy stored in a spring or other mechanical device ever put in space?

The question What is the largest delta-v ever produced in space from mechanically stored energy? asks of course about the delta-v produced, but here I'm asking about the largest amount of stored ...
0
votes
1answer
78 views

What is this long black tube snaking up to the capsule payload of the Antares rocket?

Scott Manley's video The Antares Rocket - NASA's Less Famous Ride To The Space Station includes some file footage of Antares rocket launches. There is a long black tube or cable snaking its way up to ...
5
votes
1answer
94 views

Is deformation of the impact attenuation system visible on the surviving Apollo command modules?

As pointed out in this question, the Apollo command module had crushable ribs along one edge of the base of the cone, and crushable struts that suspended the crew couches inside the vehicle. I've ...
3
votes
1answer
190 views

Why don't the hottest temperatures of a re-entering spacecraft occur near the “bottom”?

The paintings of the Apollo command module and space shuttle below portray the heating effects of re-entry. The whitest parts of the spacecraft get the hottest, with cooler parts in red and darker ...
2
votes
1answer
123 views

Where would one deploy deep space atomic clocks?

Space.com: NASA IS LAUNCHING A GPS SYSTEM FOR SPACE NASA/JPL news: Five Things to Know about NASA's Deep Space Atomic Clock NASA mission pages clock NASA Deep Space Atomic Clock Fact Sheet The first ...
4
votes
2answers
130 views

Luna 15 - Any official confirmation of objectives?

Russia's Luna 15 crashed into the lunar surface shortly after Apollo 11 landed. It's widely considered a failed sample return mission, but did Russia ever officially announce that sample return was ...
1
vote
1answer
70 views

Could in situ (in-rocket) evaporative cooling/refrigeration be used for methane or hydrogen cryogenic propellants?

@Uwe's excellent answer to the question Why would sub-cooled LOX tanks need to “topped-off” until the last minute or so? explains that the LOX is sub-cooled in situ within the rocket's tank using ...
6
votes
0answers
72 views

What orbital mechanics toolkits available today are suitable for a real-time simulator?

I'm a software engineer and I've always loved Orbiter (also here). However I feel that it's growing a bit antiquated, and it would be nice to have a more modern, open source, or otherwise hackable ...
5
votes
1answer
126 views

Why can’t cryogenic propellants be storable, at least on the ground, via refrigeration?

Cryogenic fuels (liquid hydrogen, liquid methane)1 and oxidisers (liquid oxygen)2 are the rocket propellants of choice where raw performance is the overriding concern, due to the very high performance ...
4
votes
1answer
65 views

How would off-apsis burn effect the angle and position of new apoapsis

Let's say you have an elliptical orbit, if you burn prograde at the periapsis, you extend the apoapsis by some factor(according to vis-viva equation). But if you burn prograde on somewhere during the ...
18
votes
1answer
2k views

Does the Long March-11 increase its thrust after clearing the launch tower?

The NASA Spaceflight article China conducts first Sea Launch mission with Long March 11 launch of seven satellites links to the YouTube video China’s first sea launch: Long March-11 launches from a ...
3
votes
1answer
72 views

Testing of a first stage using dummy upper stages?

The first stage of the Saturn I was tested three times using dummy upper stages filled with ballast water, see Project Highwater and this question. The first two flight tests of the Saturn V (SA-501 ...
1
vote
0answers
31 views

Tidal locking of celestial bodies [closed]

Generally moon always faces the same side towards the Earth. People say it is tidally locked. How is any body in space tidally locked and is this forever?
0
votes
1answer
45 views

GLOM of a launch vehicle

What do you mean by GLOM of a launch vehicle? When I googled about it, it says it is a type of mass but I am unclear about it.
2
votes
1answer
96 views

Was there a history of segmented solid rockets prior to the Shuttle?

The Shuttle famously (perhaps infamously) had its solid rocket boosters built in segments, which were transported to KSC and then joined together. The SLS will similarly have segmented SRBs. Were ...
4
votes
2answers
139 views

Why did the manned Mercury-Redstone flights carry and use retrorockets?

The Mercury-Redstone programme, a subset of the Mercury human spaceflight programme, used a modified version of the Redstone missile for suborbital flights in space. It culminated in two manned ...
2
votes
1answer
96 views

How far would the ISS need to be to keep it's attitude with the earth from tidal forces without needing control moment gyroscopes?

I believe the ISS uses control moment gyroscopes (CMGs) to always have the same side facing the earth. How far from the earth does an object the size of the ISS need to be tidally locked with the ...
4
votes
1answer
45 views

What format is a “TSA Ephemeris?”

I am working on software that needs to parse an ephemeris file for the ISS. However, I cannot find any documentation for the particular format I have. The only mention I found is in this ...
0
votes
0answers
36 views

Exit pressure for Rocket Lab Curie engine

What do you think the exit pressure for rocket lab curie engine could be?and the area ratio as well? its a kickstage engine and it is said that it has about 25lbf thrust.
0
votes
1answer
43 views

Exit pressure value for vacuum nozzle [duplicate]

What value of exit pressure should I use in the design equations for a small liquid rocket engine nozzle for 200km-500km operating conditions? Since using zero as a value is not possible or else ...
1
vote
1answer
103 views

On the dynamics of two connected objects located at different circular orbits

I'm just thinking about the qualitative and quantitative implications of a hypothetical orbital problem, but what I ended up does not make sense as it should. In particular, assume that two objects ...

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