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Could Superheavy land downrange and return if Starship were launched from Boca Chica?

While answering a question about Starship versus skyhooks, I discovered that there is a big difference in payload between a Falcon 9 launch where the booster lands downrange on a drone ship and one ...
phil1008's user avatar
  • 4,346
8 votes
1 answer
341 views

How actually dangerous was RTLS for the Space Shuttle?

I know that the Space Shuttle's Return To Launch Site abort mode was always considered to be particularly risky, and as a result was never tested. In particular, it seems like it requires everything ...
ikrase's user avatar
  • 8,874
2 votes
1 answer
205 views

Are there any storable non-hypergolic oxidizers?

Any list of bipropellant rocket fuels I've come across has oxidizers that are either cryogenic (liquid oxygen), hypergolic (nitric acid), or both (liquid fluorine). Are there any practical rocket ...
Mark's user avatar
  • 15.3k
19 votes
3 answers
4k views

How is the Quantum Drive performing on board the BARRY-1 cubesat?

Since 2001 there has been chatter about reactionless “quantum drives” such as the EmDrive developed by Satellite Propulsion Research Ltd. These drives supposedly produce thrust without consuming ...
Woody's user avatar
  • 21.6k
5 votes
2 answers
429 views

Could Starship lift mass to orbit (both low and geo-stationary) cheaper than a skyhook?

In response to this question which appears to ask only about space elevators and not skyhooks, would Starship's cost per kilogram to LE or Geo-stationary orbits be lower than a skyhook's? I ask only ...
user121330's user avatar
8 votes
1 answer
483 views

What Δv is needed to reach LEO from a space elevator?

In two recent questions about space elevators, the topic of reaching non-geostationary orbits came up, particularly the popular Low Earth Orbits. This question is simply about how hard exactly it is ...
leftaroundabout's user avatar
5 votes
2 answers
477 views

Propulsion options for orbital transfers after release from space elevator

In a recent discussion of cost estimates of hypothetical space elevators it was mentioned that a space elevator is (obviously) well suited to bring payloads to a geosynchronous orbit while reaching ...
Peter - Reinstate Monica's user avatar
11 votes
1 answer
1k views

How well is JWST doing on maintaining its Halo orbit?

I looked around a little bit online but did not find anything discussing how well JWST is doing with managing its orbit. I was wondering if there were any surprises or issues. It's been out there ...
BradV's user avatar
  • 3,292
2 votes
0 answers
86 views

STS: Why was there a two-minute delay between MECO and the LOX dump?

Organic Marble's answer to STS: How much thrust did the nominal post-MECO LOX dump produce? explains that the LOX dump was only started two minutes after MECO, while it was also desirable to finish ...
TooTea's user avatar
  • 1,585
0 votes
0 answers
64 views

How many U.S. launch vehicles have failed on initial launch? [duplicate]

I'm doing some research about U.S. launch vehicle failures, and particularly failures occurring during the first vehicle launch. I'm trying to get some data about how frequently failures like this ...
Gil's user avatar
  • 1
5 votes
1 answer
183 views

Rates of change of Euler angles to angular velocity of a rotating coordinate system

I am trying to implement the conversion between TEME and GCRF frames following the same procedure as done in SPICE. After digging into CSPICE's code, this transformation is performed through the ...
Rafa's user avatar
  • 1,750
12 votes
5 answers
4k views

Would Starship be able to lift mass to orbit (both low and geo-stationary) cheaper than "any" space elevator?

A comment to an answer to a question about Mars missions stated that using Starship to launch mass to orbit would be cheaper than a space elevator. I didn't imagine that. I know that space elevators ...
Peter - Reinstate Monica's user avatar
1 vote
0 answers
40 views

What was the mass flow rate of the Titan IIIE stage 1 during the voyager 1 launch

I am doing a project and I cant seem to find an exact value for the mean mass flow rate of the Titan IIIE booster during stage one of the voyager 1 launch?
owinius's user avatar
  • 31
7 votes
2 answers
909 views

Is it ever normal to vent LOX from spacecraft with active engines? Isn't it a fire hazard?

This is regarding: "SpaceX Chief Executive Elon Musk says a propellant dump caused the destruction of the Starship upper stage" "Musk said the failure was linked to venting liquid ...
TheMatrix Equation-balance's user avatar
1 vote
6 answers
3k views

Why is there never enough room on satellites to hold all the equipment needed?

Why can a satellite run infrared and other forms of data collecting equipment and stream live results back for the public, but not take photos or video? I am guessing there is never enough room to ...
William devries's user avatar
11 votes
3 answers
2k views

An alternative architecture for a mission to Mars

This image, which is supposed to represent the current architecture of the mission to Mars by NASA, raised a wave of emotions. People find it too long and complicated. But is it really possible to ...
Saturn V's user avatar
  • 1,303
-4 votes
1 answer
124 views

What Kind of Space Problems Do You Solve with Python and other prosaic software tools? [closed]

In looking at different job listings for space companies, I see some tools which are obviously specific to aerospace and high-end engineering, but also a lot of very run of the mill software skills ...
Chris B. Behrens's user avatar
-4 votes
1 answer
144 views

confusion regarding the stars in sky [closed]

Although directly looking at sun with naked eye is very risky health wise but I heard from someone that the sun that we see is what actually it looked like 8 minutes ago as light takes 8 minutes to ...
ATJ's user avatar
  • 1
0 votes
0 answers
67 views

How to do Preliminary Analysis of Spacecraft Primary Structure?

I'm looking for specifics as to how preliminary analysis on spacecraft primary structure is performed (prior to CLA). I understand LV providers include CG load factors in their user manuals, but how ...
Retsied's user avatar
  • 141
2 votes
1 answer
280 views

Why aren't more companies manufacturing the RS-25 (Space Shuttle Main Engine)?

The RS-25 is a great engine with a terrific ISP. It was used 42 years ago (on April 12th 1981) for the first Space Shuttle flight; therefore, the most of the patents on it must have expired long ago. ...
phil1008's user avatar
  • 4,346
1 vote
1 answer
137 views

Question on improved SSME thrust chamber construction

How do you get the closed out copper liner of the thrust chamber, which is hour glass shaped, into a jacket that is also the exact same shape like shown? I'm gonna guess it was done by diffusion ...
Meatball Princess's user avatar
2 votes
0 answers
62 views

Has propulsion utilizing solar sail / drag effects of solar panels achieved orbital rendezvous? If yes, is there any utility for clearing space junk?

It has been proposed to use solar panels as solar sails and drag control by alternately feathering panels during different phases of orbit. It is claimed this can alter light pressure and drag enough ...
Woody's user avatar
  • 21.6k
7 votes
1 answer
262 views

Will ISS astronauts be able to observe the 2024 solar eclipse?

Observing a total solar eclipse is an amazing experience, but observing it from orbit would be truly spectacular. The ISS astronauts could potentially have an opportunity in 2024, but will the ground ...
Woody's user avatar
  • 21.6k
11 votes
4 answers
6k views

Do the flames from a rocket cast a shadow, and, more generally, does the rocket exhaust cast a shadow?

Also, would there be any difference between shadows cast by the exhaust from a rocket as opposed to the flame from a rocket?
Chuey's user avatar
  • 111
5 votes
0 answers
116 views

What materials are used for human spacecraft pressure vessels and why?

I'm looking for what specific aluminum alloys are used for human-rated spacecraft pressure vessels (habitable module) and why. I've been able to find the material for Orion is Al-2219 but nothing for ...
Retsied's user avatar
  • 141
7 votes
1 answer
154 views

How is the equation for non-spherical gravitational accelerations derived?

I am referencing Vallado (4th edition) to understand the acceleration contributions on a spacecraft due to non-spherical gravitational effects. Generally, I understand this derivation, except for how ...
Danny's user avatar
  • 215
3 votes
1 answer
180 views

Why does the Vulcan-Centaur upper stage do ullage burns after engine shutdown?

During the livestream of the recent Vulcan-Centaur launch, the animation of the upper stage shows what appear to be extensive ullage burns (at least four minutes, at least three minutes, and at least ...
Mark's user avatar
  • 15.3k
2 votes
3 answers
296 views

Why does NASA suit color coding not follow conventional navigation color coding?

Pictures of NASA spacesuits like the ones below of Neil Armstrong’s Apollo suit (from the Smithsonian) and Gemini suit usually show the right wrist connection red and the left blue. Color coding for ...
Woody's user avatar
  • 21.6k
6 votes
2 answers
126 views

Would tidal forces be strong enough to stabilize a configuration where one satellite is being used to tow another satellite?

The scenario that I'm contemplating is one in which there is a first "depleted satellite" that has run out of propellant and a second "rescue satellite" that is designed to rescue ...
phil1008's user avatar
  • 4,346
18 votes
1 answer
5k views

What’s the story behind the Armstrong shoe phone gag?

What’s the story behind the shoe phone gag: One internet source labels it as “Neil Armstrong and David Scott with their Gemini 8 shoe phone gag… the tag reads Emergency Communication earphone”. http:/...
Woody's user avatar
  • 21.6k
2 votes
1 answer
118 views

How to make a velocity(time) XYplot graph in NASA's GMAT R2022?

I'm wondering how to design a graph in NASA's GMAT (Version R2022a), which shows satellite's linear velocity on time or on altitude from primary body (Earth). When I open the XYplot design window ->...
Asni's user avatar
  • 23
4 votes
1 answer
262 views

Starlink Dishy parameters and satellite recognition

I have two questions: What are the antenna parameters of Starlink dish antennas (like antenna gain, directivity, etc)? Is there any way for me to know which satellite my Starlink dish is ...
babibooooooo's user avatar
11 votes
2 answers
1k views

Changes to Apollo that enabled heavier missions

This question has a table that shows the dry weight of the LM grew by 1600 kg between Apollo 11 and 17. What enabled this weight growth? I know some of it was enabled by improving descent engine ...
Hobbes's user avatar
  • 128k
1 vote
1 answer
93 views

What is a spectral shift?

I have to research this topic for a school project and nothing is showing up other than redshifts and blueshifts and Doppler shifts. Are these all under the spectral shift category? Is a spectral ...
1234's user avatar
  • 11
1 vote
2 answers
260 views

What can possibly accelerate space elevator to these types of extreme velocities?

Is it possible for a space elevator not to just reach speeds of a few hundred km/h, but much faster. Since in the future, people might want to go up to GEO to maybe work there and come back home on ...
The Rocket fan's user avatar
7 votes
1 answer
276 views

Is the Falcon 9 or Falcon Heavy allowed to launch nuclear material?

Certain missions, like the various NASA Mars Rovers (Curiosity, Perseverance, Opportunity, etc.) contained either RTGs for power generation or RTHs for heating purposes, and these contain nuclear ...
Dragongeek's user avatar
  • 18.8k
2 votes
0 answers
88 views

How to Analyze and Size Spacecraft Structures: Loads Development & Structural Dynamics

Hello, I'm a mechanical/aerospace design engineer trying to expand into structural analysis. What I'm looking for: A guide or summary as to 1) how spacecraft design loads are determined, and 2) how ...
Retsied's user avatar
  • 141
25 votes
5 answers
6k views

Why is it so hard to build a closed-loop ecological life support system?

Why is it so hard to build a closed life support system for humans? There are "ecosystems in a jar" even with fish that are stable for many years. It is clear to me that humans have much ...
Saturn V's user avatar
  • 1,303
4 votes
1 answer
150 views

What is the current state of the art in converting between mean and osculating orbital elements?

I want to implement algorithms to convert from mean to osculating elements, and vice versa. I've been digging through Vallado's text (fourth edition), and under ...
Danny's user avatar
  • 215
0 votes
0 answers
64 views

How well can we predict asteroid impact location?

concern in December 2004 when initial observations indicated a probability up to 2.7% that it would hit Earth on April 13, 2029 - wikipedia on 99942 Apophis So we can predict that something might hit ...
Vorac's user avatar
  • 499
3 votes
1 answer
200 views

connecting two satellites [closed]

How strong would my bond have to be if I wanted to closely connect (30cm - 1m link) two satellites on the same orbit in LEO? (I can move the satellites however I want to have them close to each other) ...
Leonie's user avatar
  • 31
-1 votes
1 answer
122 views

What should be the fuel mass of a hypersonic (Mach 7) rocket using APCP fuel that would deliver a 50 gram payload?

Well, I used this rocket calculator besides asking ChatGPT and BingGPT and both gave me similar answers where the amount of fuel would be around 300 to 4000 grams of APCP fuel. And 30 to 100 grams for ...
Fulano's user avatar
  • 153
8 votes
3 answers
1k views

What can one do as an individual to help support the development of skyhooks?

In my recent research on the potential of a SkyHook, I've found a startling gap: it seems like no one is actively pursuing this technology. Many, including myself, believe that this could be the ...
Dino 's user avatar
  • 81
2 votes
2 answers
95 views

Space Exploration: Recommendation for Books

I have a master degree in Electrical Engineering specialized in RF. I would like - as a "hobby" in my free time - to get a deeper technical knowledge on what concerns physics in space and ...
Tripola's user avatar
  • 123
9 votes
1 answer
951 views

What are those yellow trussed structures on Hubble Space Telescope?

Search as I might, I couldn't find them labeled on any schematic or mentioned in any fact sheet. My guess is Shuttle bay interface/attachment, but I also could not corroborate it by searching ...
ymb1's user avatar
  • 2,423
22 votes
1 answer
2k views

Could an acid-proof, solar-powered aircraft stay aloft on the sunny side of Venus more-or-less indefinitely?

The length of Venus's solar day is 116.75 earth days ($t$ = 10,087,200 s) and it's radius, $r$, is 6051,800 m, so in theory an aircraft would only need to travel at a ground speed, $s$, of... $$s=2\pi ...
phil1008's user avatar
  • 4,346
1 vote
0 answers
62 views

Diameters of moons in solar system

I would like to programmatically find all moons in our solar system above a certain diameter. I would like to use the api to jpl horizons if possible. (For context I am then going on to find ...
Cortado-J's user avatar
  • 111
2 votes
1 answer
255 views

Composite pressure vessels for manned spaceflight

I read about the Composite Crew Module and it looks like they used aluminum honeycomb between two layers of composite. Why didn't they just make the whole thing out of composite? Why is carbon ...
Saturn V's user avatar
  • 1,303
1 vote
0 answers
42 views

What figure-of-merit (FoM) is used to characterize the performance of a launch system's reentry-and-landing system?

I'd like to make a table that compares the performance of different launch systems such as The Space Shuttle, Falcon 9 plus Crew Dragon, and Starship. Engine ISP and thrust-to-weight ratio would be ...
phil1008's user avatar
  • 4,346
2 votes
0 answers
75 views

How is the trajectory of a gravitational assist flyby mission computed?

Based on much research after posing my previous question, as well as the discussions with the rest of the community, I now (think I have) a deeper understanding of how mission planning works. Based on ...
hi-bye125's user avatar
  • 404

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