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0answers
25 views

Why do we see performance drop in the aerospike engine in Mach 1 to Mach 3 speed?

While reading about aerospike engine here https://www.hq.nasa.gov/office/pao/History/x-33/aero_faq.htm I read that (Question 11 in the FAQ) due to the slipstream turning into the nozzle region we ...
3
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0answers
16 views

Measuring and analyzing the tumble of space debris

How well or accurately can we measure the tumble of space debris? I know that we can make ground-based measurements based on light curve data acquired by telescopes. Can tumble be measured from radar ...
0
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0answers
33 views

How did the space crew-1 went to the ISS?

I'm not sure if it's the right place to ask, also it's about orbital mechanics. So maybe i could've looked on the internet a lot more to find my answer but i did not, so may i ask you ? I'm not at all ...
0
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1answer
29 views

Measurement and estimation of temperature of space shuttle nose cone during onward and return journey

In the onward and return journey of space shuttle, what are the measured and estimated temperatures (or distribution) of the shuttle nose cone at the same spatial coordinates? During lift off, the ...
1
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1answer
80 views

What does “MΔV” stand for in the rocket equation?

I'm currently trying to understand how the Rocket Equation works. I've gotten this far: mv = (m+Δm)(v+Δv) − Δm(v−ve) Left side is the momentum of the rocket+fuel BEFORE, and right side is the momentum ...
2
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1answer
62 views

What is the origin of the Lunar Module in the US Space and Rocket Center in Huntsville, AL?

I recently had a chance to visit the US Space and Rocket Center. While I was there, I saw a lunar module. It is very clear that the ascent portion is a mock-up, but the decent portion looks real, ...
3
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1answer
87 views

Names of geographic features on moons or planets other than Earth found later to be controversial or provocative? Have any then been changed?

The names of places and geographic features (and even buildings) on Earth is an interesting topic; sometimes they are later changed after concerns are raised. And of course there is the deliberate ...
1
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0answers
29 views

When was the last time Skyfield (Python package) updated its implementation of SGP4?

The first release on Github was in 2014. I have noticed Brandon Rhodes has contributed quite a bit to the Skyfield source code, so I will tag him here and in a comment.
6
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1answer
36 views

Advantages/disadvantages of wood for surface of cubesat?

Generally aluminum and kapton are the exterior surfaces of a cubesat. A Finnish/ESA cubesat, the WISA/Woodsat was launched that has plywood panels. It has protection against offgassing and very low ...
1
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0answers
71 views

How (the heck) is it possible that with China's future 6G satellite network I'll be able to download 1000 movies per second?

The reasonably credible Wall Street Journal has a YouTube channel and the new video SpaceX vs. China: The Quest for Satellite Internet | WSJ says that with Starlink's data rate I can download a 1 Gb ...
0
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0answers
30 views

What are the advantages of building a rocket base on the moon (if there are any)? [duplicate]

Gravity is 1/6 on the moon (as compared to Earth). So to launch a rocket there will take considerably less fuel. On top of that, the moon circles around the Earth so you could give the rocket all ...
0
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1answer
65 views

How does the ISS crew adjust the color of the new LED cabin lighting? Is there a knob somewhere? Can it be programmed to change by itself?

@OrganicMarble's answer to What's the small white gadget with two black buttons in this video of the International Space Station? includes the On/Off switch for cabin lighting aboard the ISS. Is the ...
4
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1answer
88 views

Are toggle- or rocker-type switches avoided in crewed areas of space stations to avoid getting accidentally bumped?

@OrganicMarble's answer to What's the small white gadget with two black buttons in this video of the International Space Station? includes the On/Off switch for cabin lighting aboard the ISS. There ...
3
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1answer
76 views

SpaceX live broadcast of booster & boat's eye view of the GPS III Space Vehicle 5 were both uninterrupted; have they make some upgrades to the system?

This answer to Why does the video feed always fail during Falcon 9 landings? shows that SpaceX seems to be "getting better at" or "less shy about" broadcasting continuous live ...
4
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0answers
27 views

What is the difference between these various spacecraft pyrotechnics?

The following terms have been used in various Space Exploration StackExchange questions and answers. What are the differences (if any) between these various terms? detonating cord detonating fuse (...
6
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1answer
83 views

Why is the Space industry expected to flourish and grow in the near future?

I've been seeing a lot of videos talking about how the "space industry" is "exploding" and soon to be a trillion dollar industry. Obviously I know better than to just buy into the ...
5
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1answer
166 views

How long would it take for air to completely leak from a spacecraft?

If a spacecraft of volume V was leaking air of density rho as a mass flow rate of m-dot can you calculate the time for all the air to leak out using (rho x V)/m-dot? rho would decrease and m-dot ...
16
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3answers
3k views

How did astronauts tie the laces on their gloves?

I've been looking through images from the Smithsonian regarding early space exploration. In particular, I found this picture of a spacesuit glove, that has laces on it. In the picture's description, ...
3
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0answers
91 views

How many existing satellites have a continuously varying orbit because of human design decisions?

In the space community, there is an assumption that changes to an Earth satellite's orbit are infrequent (other than those due to atmospheric drag). Are there any known satellites designed to ...
2
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1answer
126 views

If Country A's rocket hits an incorrectly declared satellite of Country B, which institution can arbitrate the dispute? Under which international law?

The related recent question Which institution regulates rocket launches of all countries? was closed as it is considered as already answered 7 years ago. I would like to submit the following scenario ...
5
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1answer
129 views

At what moment during his flight did Yuri Gagarin eat?

Gagarin's flight in space was rather short, but he still had time to eat two tubes of meat and one of chocolate. The flight schedule on Wikipedia doesn't mention a meal. At what moment during his ...
3
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1answer
255 views

Can I survive long enough before being rescued, naked in space? [duplicate]

If I float in space naked, what will be the consequence for my wellbeing? What will happen to my skin? What will happen to my body due to the zero pressure surrounding me? Will the air be sucked from ...
2
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1answer
74 views

Cubesat surface material

In wikipedia I read that the structure of the cubesat are made of aluminum alloys of 7075, 6061, 5005, and 5052. Is this the surface layer of the satellite or it is necessary to cover it with kapton ...
1
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0answers
53 views

Which institution regulates rocket launches of all countries? [duplicate]

Which institution regulates the rocket launches of all countries? Meaning, suppose a country wants to launch a rocket, where do they have to report it before the actual launch and how far ahead? ...
5
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0answers
84 views

Tory Bruno mentioned “unsolvable combustion instability” of “large methane engines”. What, why, how?

Relevant tweet, an hour ago: https://twitter.com/torybruno/status/1405210138189864960?s=19 a Tweeted Question: Why wasn't methane used in the 2000s, when it was readily available unlike the time ...
-3
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0answers
43 views

How does the length of sea level engine nozzle affect the efficiency of the engine? [closed]

How does the length of sea level engine nozzle affect the efficiency of the engine ?
1
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1answer
73 views

If building a liquid propellant rocket engine, with bi propellants, how does the dimensions of my Combustion chamber, affect the efficiency?

If building a liquid propellant rocket engine, with bi propellants, how does the dimensions of my Combustion chamber, affect the efficiency ? but also what is the best C* dimensions for an earth sea ...
0
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1answer
76 views

What is an “Aceteria improved Ryan suborbital sounding rocket”?

Why does the Minotaur I wear a yellow jacket that "banana-peels" off as it launches? links to the NASA Wallops video NRO L-111 Launch (already cued at the statement in question). At the end ...
13
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3answers
3k views

Why did the space shuttle's altitude go down after reaching 108,000m?

I recently took a look at this little data sheet by NASA: Math and Science @ Work; Space Shuttle Ascent Time Altitude Velocity Acceleration Comment (s) (m) (m/s) (m/s^2) 20 1244 139 18.62 40 5377 ...
35
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1answer
5k views

Why does the Minotaur I wear a yellow jacket that “banana-peels” off as it launches?

Videos available of the recent Minotaur I launch at Wallops for NROL-111 show a yellow jacket on most of the four stage SRB-to-orbit launch vehicle. I read or heard somewhere that wires attached to ...
0
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0answers
63 views

is it a good idea to build a mars rocket in space [closed]

instead of building the rocket on the ground would it be a good idea to build a mars rocket in the same fashion as the ISS( international space station)? could you even do it?
3
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4answers
162 views

Do space industry companies want their defunct satellites back?

Space junk debate aside, many large satellite companies (and governments too) are responsible for a large number of both operational and defunct sats that are still in orbit. When other companies or ...
4
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0answers
50 views

Venera 13/14 Design specifications

Does anyone know where I could find design specifications, plan sets, or other documentation for the Venera 13 or Venera 14 spacecraft? These are Soviet spacecrafts from the 1980s. I suppose if ...
5
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3answers
211 views

How much more likely is it for a colony on Mars to receive a damaging meteorite hit than a similar structure on Earth?

Meteorite damage probability is low both on Mars and Earth, but Earth has a thick atmosphere, which Mars does not. The thinner atmosphere on Mars should yield some increase of impact probability. Is ...
34
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4answers
12k views

If an astronaut threw a cup of coffee into space, would it freeze, or boil off into gas?

If an astronaut threw a cup of coffee into space somehow, would it freeze into a block, or boil off into gas due to the zero pressure?
3
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0answers
54 views

Closed oxygen cycle methane-burning internal combustion engine for Titan rover/helicopter? Works like a battery together with RTG that won't freeze?

@TildalWave's answer to Methane internal combustion engines for rovers on Mars and Moon. Feasibility? raises the possibility of using Titan's atmospheric methane for an energy source as long as you ...
25
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1answer
3k views

How much longer did Columbia need to survive?

The breakup of Columbia occurred about 15 minutes after entry interface and the key event in this was the loss of hydraulic pressure due to burn through of all three hydraulic lines. How much longer ...
8
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1answer
148 views

Can ESA control the two Voyager spacecraft?

This is such a dumb question. There are many space organizations. Let's take ESA for this case. Given the two Voyager spacecraft are transmitting a weak radio signal to the Earth, can ESA command and ...
3
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1answer
135 views

For a crew-mission, in case of impromptu changes, what would be the most suitable depot locations for a re-supply?

Following the question on re-fuelling en-route to Mars, I am interested in exploring a mission architecture in which a crew may be offered different options for impromptu mission changes, for example ...
17
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1answer
3k views

Where exactly are the Apollo space suit sublimators venting steam into space? is there a photo of an astronaut in space that shows the opening?

This excellent answer to How have space suits dissipated the heat removed from astronauts? shows a diagram including the sublimator unit in the red square where the phase transition of water from ...
6
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1answer
190 views

Premature detonation of explosive bolts when landing on hot Venus?

@Uwe's comment below Parachute material used for the Venera probes to survive 500 °C raises an interesting issue. Venus is really hot, and pyrotechnic actuators (e.g. explosive bolts, frangible ...
3
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1answer
233 views

Why must passengers in Blue Origin flights be able to climb seven flights of stairs at the launch tower in less than 90 seconds?

https://amp.theguardian.com/science/2021/jun/12/jeff-bezos-space-auction-28m-spare-seat-blue-origin states: Passengers, the company has said, must be between 5ft and 6ft 4in tall, weighing 110-223lb. ...
2
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1answer
76 views

How reflective can laser sail coatings be?

A recent post mentions that laser sails, in contrast to solar sails, can cherry-pick coatings that are near-perfect reflectors in narrow frequency ranges. But how good is "near-perfect"? ...
2
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1answer
46 views

What are the main challenges to boosting or driving smaller solar sails with a constellation of separate reflectors?

This is to continue expanding the idea of using smaller solar sails, but increasing the energy they receive from the Sun by having a constellation1 of satellites with mirrors + lenses. For context, I ...
7
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2answers
219 views

Is there an example of a classic space engineering moment where months of work had to be discarded due to the wrong approach?

Is there any classic aviation/space engineering moment where the engineers had been working on a concept for months and then realised that their approach to the problem wasn't quite right and so had ...
1
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0answers
32 views

Could there be a relatively stable near-rectilinear halo orbit associated with the Sun-Earth L1 or L2 points? Would the Moon screw it up?

Question: Could there be a relatively stable near-rectilinear halo orbit (NLHO) associated with the Sun-Earth L1 or L2 points? Would it be similarly stable as the Earth-Moon NLHO proposed for the &...
1
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0answers
33 views

Prop feed with Anhydrous Ammonia in Microgravity

Considering contributing to an SBIR through my PhD where we're looking at NH3 as a green prop solution. Need to figure out how to feed vapor from a liquid/mixed phase tank to the a prop system. ...
5
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1answer
116 views

How did the Venera Probes manage to safely descend to the surface of Venus?

I have a two part question in reference to the answers provided for the linked question below: Why did the Venera missions land so close together? The answer stated: ”Not only did they land near local ...
4
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3answers
719 views

Time gap between leaving the Earth's atmosphere and initiation of orbital motion by space shuttle

It is sometimes difficult to imagine for people like me how the space shuttle initiates its orbital motion (at a speed of 17500 km/h). So when the space shuttle goes out of the Earth's atmosphere, how ...
2
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1answer
142 views

How do we get to Mars in a week (7 days)?

Looking at the times that are quoted to go to Mars (months) makes me wonder what speed do we need to get there in a week? Chemical rockets can get to ~4.5 Km/s, thermal nuclear rockets is about twice ...

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