All Questions

Filter by
Sorted by
Tagged with
1 vote
1 answer
175 views

Change in True Anomaly over time

From Wikipedia, the True anomaly is defined as the angle between the direction of periapsis and the position of the celestial body. I'm trying to find how the true anomaly changed over time for a ...
Shawn Lim's user avatar
  • 185
5 votes
3 answers
4k views

Why not use containers to clean up small space debris?

Small space debris is a serious problem. I think that if a large container orbits full of space debris and sweeps up small pieces of space debris that fit into the container, the space debris can be ...
전현서's user avatar
  • 101
7 votes
1 answer
191 views

Does SpaceX clean the outside of Dragon between flights?

We see that for the first stage, Falcon 9 boosters, SpaceX barely cleans the soot off. (Generally the soot comes from flying through the engine exhaust of boostback, reentry, and landing burns.) The ...
geoffc's user avatar
  • 79.5k
4 votes
1 answer
178 views

splashdown time Dragon vs Soyuz

Why did it take 3 days for dragon since detach from ISS till splashdown - while Soyuz would take 3 hours ?
user53342's user avatar
2 votes
1 answer
98 views

For using the acceleration due to drag formula, which coordinate frame should the satellite's position and velocity vectors be in?

I am working on simulating the space environment for a VLEO satellite. I am working on the atmosphere model where I am using density values from NRLMSISE00 model and plugging them into the drag ...
Anusha's user avatar
  • 85
10 votes
2 answers
1k views

How were the control surfaces of the Space Shuttle designed to withstand the forces of reentry?

Perhaps the most critical part of the Shuttle's flight is the communications blackout phase of reentry, when atmospheric plasma is directly interacting with the vehicle's heat shield. As I understand ...
ijustlovemath's user avatar
0 votes
0 answers
76 views

Orbital Pathing Question [duplicate]

I have seen nearly all orbital 2D projections done like a sine wave. However, when I watch a launch from say, Cape Canaveral, it always "appears" that they are launching due east rather than ...
Skittles's user avatar
  • 101
1 vote
0 answers
110 views

Is my code correct to get six Keplerian parameters?

Is my code correct to get six Keplerian parameters? ...
jack's user avatar
  • 19
12 votes
5 answers
6k views

Why are orbits around a black hole not elliptic?

Most of the pictures of a black hole are like this: Source: https://cdn.mos.cms.futurecdn.net/HsDtpFEHbDpae6wBuW5wQo-970-80.jpg.webp Why are the orbits around it not elliptic? Is there any other ...
N.Li's user avatar
  • 123
1 vote
0 answers
50 views

Simulation satellite channel in Matlab

Where can I find values for delays and pdp to simulate the satellite-ground channel? PS 3GPP TS 36.116 document contains multi-path delay profiles used for the performance measurements in a multipath ...
Aid22's user avatar
  • 109
1 vote
0 answers
138 views

Was there ever a crewed space mission that could possibly escape the solar system? [duplicate]

The German song "Major Tom" adds a twist onto David Bowie's "Space Oddity", by giving clues to the spacecraft commander Mayor Tom to deliberately abort the mission in favor of ...
dronus's user avatar
  • 111
2 votes
0 answers
113 views

What is the white felt-like material between the heat shield tiles and stainless steel skin of Starship likely to be?

I suspect that the white padding material between the tile and the stainless steel skin might be [Nomex Felt][1], but I don't really know. Nomex was used on the Space Shuttle. Flame-Resistant Felt - ...
phil1008's user avatar
  • 4,240
3 votes
0 answers
67 views

Force Constant of liquid propellants, RP-1 >1200 kJ/kg

I am familiar with testing of the force constant for solid propellants using the closed bomb test. But what test method is used to obtain the force constant of liquid propellants? And is the force ...
Mrr's user avatar
  • 41
5 votes
2 answers
247 views

Is it possible to use the Starlink laser mesh network for science? What kind?

In the news there was an article about Starlink beaming 42 million GB of Data per day. Also it states that the lasers form a global mesh network of 9000+ lasers. There are 260.000 acquisistions per ...
twildeman's user avatar
  • 151
3 votes
0 answers
90 views

How bad is a non-Lagrangian Point orbit?

I am no expert on space physics, just an interested amateur. I've been searching for a few weeks and having a hard time gaining insight on this question. Phrasing the question more specifically: how ...
David M. Perlman's user avatar
15 votes
2 answers
1k views

Are suits in the NBL pressurized differently than during flight?

I don't know why I've been in a spacesuit mood lately, but the following crossed my mind recently: the flexible portions of NASA'S EMU suits are inflated by the interior pressure the suits in the ...
Erin Anne's user avatar
  • 11.2k
4 votes
2 answers
264 views

Engine most likely to be available in the next 80 years to accelerate a craft at 1G for 4 weeks [closed]

I am wondering what type of engine would most likely be available in the next 80 that can constantly accelerate a spacecraft at 1G. Preferably, it could accelerate it for 4 weeks. The engine could be ...
Tom's user avatar
  • 141
11 votes
3 answers
5k views

Why does everyone say that it is better to launch a satellite into polar orbit from the pole than from the equator?

If the Earth were spherical, I would agree with this. But the Earth is not spherical. And at the equator, the radius of the Earth is 21 km greater than at the poles. By convention, the altitude of the ...
Roman's user avatar
  • 113
1 vote
0 answers
85 views

Tether materials considerations for sky hook with jet engine

Suppose a skyhook was deployed with orbital dynamics mechanics such that when its hook side (opposite the counterweight) entered the atmosphere, it was nearly stationary with respect to local air ...
user121330's user avatar
2 votes
0 answers
68 views

Would (Dual Spool and Concentric Powerhead) FFSC Cycle engine be possible to engineer

I,ve been wondering if it was possible engineer and how we would we work it out DUAL SPOOL FFSCC ENGINE with concentric core and individual concentric turbine inside one another and maybe it could ...
ALPHA X FUTUR COMPANY AEROSPAC's user avatar
4 votes
1 answer
154 views

Is Delta the same as SpaceShip III and if not, has SpaceShip III been de facto cancelled?

In the recent months, Virgin Galactic is talking about some Delta spaceship that is about to launch space tourists every week. They want to retire the SpaceShipTwo this year and shall begin flight ...
Johannes's user avatar
3 votes
1 answer
197 views

RS-25 Component weight

I need to determine the weight for specific components of the RS-25 Rocket engine. Namely the combustion chamber and nozzle separate from all other engine components? I must have found hundreds of ...
Slartibartfast's user avatar
3 votes
2 answers
603 views

Fueling the RS-25 Turbo pumps?

Is there any way to know the weight of Fuel / Oxidizer consumed by just the turbo pumps of the RS-25 rocket engine?
Slartibartfast's user avatar
6 votes
1 answer
1k views

Apparently the ISS cupola windows are Replaceable in orbit. What is the pressure hatch design and procedure used when the window is leaking?

Photo: ESA In this answer to How (the heck) do you replace a space station window in orbit? it is explained that cupola windows can be completely replaced in orbit. Unfortunately, one of the .pdf has ...
Woody's user avatar
  • 21.6k
4 votes
0 answers
195 views

Have external food/drink for EVA suits been considered?

This chat between ex-Mythbuster Adam Savage and ex-astronaut Mike Massimino mentions the danger of getting water inside your helmet in freefall. I idly mused about a (probably stupid) idea: that if ...
Erin Anne's user avatar
  • 11.2k
8 votes
2 answers
2k views

How do cosmonauts board the Soyuz spacecraft?

The Soyuz spacecraft consists of an orbital module, a descent module and a service module: (https://commons.wikimedia.org/wiki/File:Drawing-Soyuz-TMA-exp12.png) The spacecraft is fitted into a ...
Dave Gremlin's user avatar
  • 2,891
3 votes
0 answers
61 views

Righting JAXA's SLIM Lunar lander using RCS

The SLIM lander was supposed to roll onto the side as part of the landing process but ended flamey end up. Which has impacted the ability of the vehicle to collect solar power, and probably other ...
GremlinWranger's user avatar
3 votes
3 answers
186 views

Could a rotating skyhook use a sail or wing to make orbital corrections to keep the structure in orbit?

Imagine a rotating skyhook with the majority of its length in the thermosphere, but whose hook side (as opposed to the counterweight side) has the ability to deploy wings or sails. Suppose that ...
user121330's user avatar
5 votes
1 answer
924 views

What is the TRL of a skyhook?

A recent answer on this question mentioned that skyhooks have a low TRL. This is probably due to many factors since they have not been built yet. What is the current TRL/status of skyhooks and what is ...
The Rocket fan's user avatar
20 votes
4 answers
9k views

Who navigates the ISS?

The ISS orbits around the world. Do astronauts fly the ISS on Earth's orbit like a plane pilot? If it wanted, could the ISS go to a specific part of the world apart from the the usual orbit? Does the ...
Beyhan Çıtak's user avatar
4 votes
0 answers
157 views

Is there such a thing as relativistic maneuver?

Specially for a fast probe to alpha centauri, where two massive bodies are available, is there a calculation of how many degrees can a relativistic body turn using these bodies, depending of the speed?...
arivero's user avatar
  • 141
4 votes
0 answers
216 views

What are the arms for under the nozzle of NASA engine tests?

When NASA tests rocket engines at the Stennis Space Center, the engines have two arms under the nozzle. When the engines start these arms swing out of the way of the exhaust. What are these arms for? ...
Tom's user avatar
  • 41
0 votes
0 answers
45 views

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
  • 4,240
8 votes
1 answer
334 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
204 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
426 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
481 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
476 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
  • 3,294
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
182 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
39 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
906 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
123 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
142 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

15 30 50 per page