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Questions tagged [spacecraft]

Questions regarding the craft that house humans or equipment during space exploration.

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0answers
53 views

How many ships are ready to launch? [duplicate]

In the wake of the Russian launch failure to send more astronauts to the ISS, it got me thinking. How many "ready to fly" ships are there? And, if an accident were to happen and the current ISS crew ...
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9answers
10k views

Assuming a spacecraft is traveling in a constant rate and our Astronaut will exit it to a space walk, will he be “left behind” by the spacecraft?

Lets say our Spacecraft is traveling to a remote Galaxy at a constant speed of 1/X of the speed of light. A brave Astronaut is leaving the spacecraft to a space walk, while not being attached to the ...
2
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1answer
331 views

What was the cause of the cooling system issue in Sputnik 2?

I've heard that there was a problem in the cooling system on sputnik 2. But, was it an engineering error? Obviously a dog cannot survive such harsh conditions. Did the engineering team overlook this ...
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1answer
68 views

How can I know if NASA Horizons output is measured, calculated, estimated or what-else?

This link allows downloading from NASA Horizons server data about the distance of a body (OSIRIS-REX spacecraft ) from the Sun (see link here): How can I know how the distance is obtained? Is it ...
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0answers
26 views

What is a four-orbit rendezvous? [duplicate]

In a book I'm reading, there is a sentence like this: However, such a long rendezvous is cramped, uncomfortable and not the most efficient use of time for astronauts or Mission Control, and so ...
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1answer
71 views

What were the different tests that were conducted pre-launch of Apollo 11?

I’ve done some research about the Apollo 11, and I don’t really understand what happens with different kinds of pre launch tests. For example, what are first-stage propellant tanking tests? And also, ...
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1answer
179 views

Radial variation of atmospheric pressure in rotating O'Neill cylinder-like ship? (Rendezvous with Rama)

Sir Arthur C. Clarke was a science writer as well as a prolific writer of science fiction (including hard SF*), and his stories usually had a substantial footing in science. His book Rendezvous with ...
4
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1answer
102 views

At what point when travelling faster and faster around the earth are you not gonna be falling back again (7km/s? 8km/s?)

My dad and I thought about a problem we had when discussing Earth's gravitational field. This wasnt the original question but I still would like to know the answer. So essentially my question is: ...
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0answers
74 views

How to calculate azimuth and elevation angles from satellite point of view of a ground station?

How to find azimuth and elevation from satellite of a ground station when yaw, pitch, roll, lat, long position of satellite and lat, long position on ground are given? ...
2
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1answer
60 views

Nadir sensor for a spacecraft attempting to land

Is it possible theoretically for a sensor to detect Nadir? This could actually be of extreme value as generally spacecraft attempting to land need to maintain certain heading w.r.t Nadir as a function ...
2
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1answer
101 views

Do astronauts have to use sunscreen?

Of course the space suits can block most part of the radiation, but do the astronauts need to use sunscreen to protect their faces from the radiation passing thought the helmet or passing through the ...
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1answer
79 views

How large would a alien spaceship have to be to affect the earths gravitational orbit? [duplicate]

Would a large enough ship generate enough gravity to affect earths course?
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1answer
231 views

What is the terminal velocity on Mars?

How would I calculate the terminal velocity of Mars? Bonus: Could entry of Mars with balloons work like this similar to the linked question?What would the BFS' landing on Mars be like, if it is ...
4
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2answers
809 views

Have there been any spacecraft with internal SRM other than CONTOUR?

I read about the CONTOUR mission which used an internal solid rocket motor to change the trajectory. Have there been other spacecraft using a solid rocket motor which is not jettisoned after usage?
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3answers
112 views

Feasible way to detect masses without natural light in deep space?

While I was perusing the entries here on energy sources for interstellar travel, it occurred to me that a problem accompanying a low energy density in space distant from stars is darkness. Is there a ...
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2answers
973 views

Are any of these Soyuz controls involved in separating the orbital module?

According to this Q & A, it's very likely that the Soyuz spacecraft's orbital module can be manually separated independent of other spacecraft operations. On this CollectSpace page, there's an ...
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5answers
3k views

What would be necessary in order for us to achieve a single stage to orbit, reusable rocket?

I have read articles and seen videos explaining why an SSTO (Single Stage To Orbit) rocket* is not possible. But I was wondering... What would be required to achieve this? Answers can be literally ...
5
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2answers
221 views

What is the timespan for a block of Phobos to reach a low orbit around Mars with a solar sail?

Edit: Although this question has been marked as a duplicate of this one about solar sail thrust calculation, they are different because I ask about a solar sail that has an orbital trajectory and ...
2
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2answers
122 views

G - forces imparted by launchers

How can one know the G forces imparted from the technical data presented on the websites of launch vehicles? I am interested in finding a way to theorise the max G-forces imparted by researching ...
5
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1answer
82 views

Synchronizing spacecraft communication

When NASA is giving commands to a distant spacecraft like Juno, how is that done in terms of timing and protocol? For example do they: give a command to burn for 15 seconds upon receiving the ...
4
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1answer
263 views

What are these Space Shuttle cockpit elements and what are they for?

In a book I'm reading, there is a figure showing the inside of a cockpit of a Space Shuttle.The labels point out various pets including an aluminum plate, an avionics bay, and an open grid panel, as ...
10
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1answer
312 views

Why aren't magnetic bearings used more frequently in reaction wheels?

This answer implies that it's due to budgetary constraints, but given that Kepler, Dawn and Hayabusa all had reaction wheel problems with lubrication before the end of the planned lifetime, it sounds ...
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2answers
1k views

Can we survive Van Allen belt radiation?

Is it true that it is impossible to survive Van Allen Belt radiation? I mean do human die on the spot or latter in their life with cancer?
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1answer
71 views

Would we be able to see a Space craft transit in Lunar orbit?

If a Apollo type Moon mission happened today would we be able to see it transit in Lunar orbit? I know we can't see the Landing sites of the Apollo but could we see the Command Module and its shadow ...
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4answers
797 views

What is the fastest can we or have ever traveled in space?

What is the fastest vehicle currently in space? At what speed with our technology currently does physics restrict our speed limits in space?
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7answers
8k views

What is the rarest launch window?

What situation would make a launch window rare? What is the rarest known launch window?
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1answer
259 views

Machine Learning and Classical Navigation, Guidance and Control in Space Exploration

Due to the increasing availability of large quantities of data and computational power, machine learning (ML) is providing increasingly better results in various fields. Much research has been done on ...
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3answers
3k views

Could a Boring Company Excavation Tool be used to create a large circular chamber inside an asteroid?

I saw an awesome post by a user about 1g off-Earth habitats. Radiation protection is provided to humans when habitats have a lot of mass between habitation areas and sources of radiation. Long-term ...
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1answer
169 views

Could a spacecraft be propelled by the deflection of a very high number of charged particles?

I am wondering if a spacecraft could be propelled through interplanetary space via the deflection and/or displacement of a very high number of charged particles contained within the Sun's solar wind. ...
6
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3answers
152 views

Can you avoid the costs of cooling superconductors for magnetic shields by separating them from the spacecraft and using shades?

As the answer to this thread states, cooling superconductors in spacecraft is necessary because of waste heat from secondary systems and thermal radiation of the sun. The application in which ...
2
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3answers
195 views

Would it be better to build a Mars-fairing ship on land or in space?

This answer says: We do not have a human-rated rocket which can send a sizable payload to Mars. The Falcon Heavy is certainly capable of sending a payload there, but the rocket would need to be ...
3
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1answer
133 views

Largest delta-v from mechanically stored energy?

The math behind this answer suggests that while the delta-v delivered from hand-throwing an object from the ISS would not produce prompt de-orbit and atmospheric reentry, it would still lower the ...
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0answers
58 views

thrusters, force torque, distribution matrix , orbit maneuver

I have a few questions about computing torques and forces. I use the same configuration as in the thesis titled An Attitude Control Sysytem Design Based on the Turksat-1b Geostationary Satellite. ...
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2answers
290 views

Can you use magnets to travel through space?

My thought process is that there is very little friction in space minus gravitational pull. Which could be a good thing if you wanted to go faster or slow down. The question is, is it possible to ...
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2answers
5k views

How does a space probe maintain its trajectory while passing through the extreme gravitational field of the gas giants of our solar system?

Space probes like Voyager 1, 2, New Horizons, etc, traveled beyond those gas giants, how did they cope up with their extreme gravity? How was the trajectory of these probes unhindered by the immense ...
4
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1answer
112 views

Once a spacecraft is in space what factors determines its top speed?

Is there a limitation of speed of a spacecraft in space because of suns gravity? Is the speed purely dependent on the engineering? Or other factors comes into play?
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7answers
24k views

Why do we not fly to space with helicopters? What are the practical altitude limits?

People will tell that there is no air, and this is why we cannot. But if I read on the internet, there is air in space, much less, but still something. for example, 100 km - 0.0000006 times as much ...
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0answers
56 views

Are there any large satellite hardware suppliers for components or buses? (For CubeSats, SmallSats, Rovers, etc…)

I am looking for online catalogs of hardware either semi-COTS or full COTS (radios, antennas, thrusters, command and data handing boards, batteries, attitude control, etc...) that can be used in space ...
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3answers
4k views

Repurposing a nuclear submarine for space travel

Although a nuclear submarine might not make a great spacecraft, would it be possible to repurpose it for space travel? Benchmark: USS Illinois (SSN-786), Virginia-class submarine (born in Virginia, ...
22
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5answers
2k views

What is the general shape and size of a space probe, and how are they launched?

I am totally blind, and I haven't felt any models of space probes, so I have no idea how big they are, what their general shapes are, or what kind of launch systems they use. I'm assuming space probes ...
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0answers
31 views

Spacecraft Inertial Data

I am a developer of motion analytics algorithm. Having been using a 9 Dof IMU strap-down onto human and land vehicles for this algorithm. Would be interested to run my algorithm of a spacecraft IMU ...
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0answers
48 views

American Railgun and rocket [duplicate]

So I've seen the railgun before, and it suddenly come up in my mind: can we accelerate a space shuttle/rocket to a high speed,before turning on the engines?Will it save fuel of destroy electronics?
3
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2answers
91 views

Remaining fuel estimation/measuring Strategy in a spacecraft

During descent of a spacecraft to any planetary body the spacecraft uses retro engine with variable throttle to reduce the vehicle velocity to zero at touchdown. Inorder to compute for the amount of ...
5
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1answer
383 views

TLE SGP4 Coordinate Transformations

I am working on developing a user friendly SGP4 orbit propagator in C on a PIC24. I have extensively read Revisiting Spacetrack Report #3 and celestrak - there are a few outstanding questions I have....
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1answer
59 views

Energy needed to open/close entry points in a rocket

In general, how often are air locks opened on a rocket? How much energy is needed to open and close the entry point?
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2answers
224 views

Would space ship/station rotation for artificial gravity cause the “axis” to also rotate?

Would space ship/station rotation for artificial gravity cause the "axis" to also rotate similar to that of a helicopter with out a tail rotor? Additionally would a second rotating section going in ...
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2answers
91 views

Help computing solid angle subtended by the Earth as seen from LEO

I would need to compute the solid angle of the Earth from a spacecraft when close to the Earth, where no small angles approximation can be made. I thought it wouldn't be that hard but I feel actually ...
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0answers
36 views

Atomic Inertial Sensor

In relation to the question I was looking for the perfect sensor that would help me achieve perfect non rotating spacecraft. My search made me look for exotic phenomenon that can be utilized for such ...
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2answers
163 views

Using what technology one can keep a spacecraft truly non rotating

Inspired by the question I thought maybe a photon thruster can be used for precisely giving thrust to maintain spacecraft attitude. But soon I realized that for high precision attitude control, one ...
4
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1answer
96 views

Is there a way to reproduce Earth-like gravity on a spacecraft close to a more massive body such as the sun?

My gut impression is that an orbit would negate the feeling of gravity, and that if gravity were to be felt, it would indicate the orbit is decaying; an orbit, in effect, is the speed (or is it ...