Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [space]

The near-vacuum extending between the planets and stars, containing small amounts of gas and dust. Also called outer space to refer to the physical universe beyond the Earth's atmosphere.

3
votes
3answers
60 views

how do we navigate space without knowing the position of everything? wouldn't the gravity affect the sattelite/ship?

I tried looking for other questions but I couldn't find any. (if this is a duplicate, then I'm sorry, I just signed up, so I'm not sure what to search for) I was wondering, how do we navigate into ...
0
votes
2answers
53 views

How well can current physics predict the movement of rocks in space?

I have a question about the precision of predicting the movement of objects in space (which I believe fall under physics and not space exploration). While I suspect the main limitations here are ...
0
votes
0answers
15 views

Calculating the shielding required to protect against radiation at lunar orbit

I am attempting to calculate the thickness needed to protect the crew inside a space module at the Lunar Orbit with Lithium Hydride from X and Gamma Rays. How would I calculate the thickness of Li-H ...
-10
votes
1answer
78 views

Why do people think that rockets can thrust in the vacuum of space? [duplicate]

A force is required to change the momentum of the rocket exhaust which consists mainly gas moving out of the rocket chamber. People think that it is the rocket that pushes the gas out. If this were ...
0
votes
0answers
27 views

Can space be considered as a grid of cubes of planck length, or is it continuous? [duplicate]

I don't know how to describe it exactly, please try to understand. The question is if space is continuous or gridded. Consider a particle of planck length (or whatever is the smallest possible ...
0
votes
0answers
25 views

$F_n$ force between 2 objects in space

I am trying to do a research project for school where I'm trying to simulate the physical world in a computer environment. So far things have been working great but I have trouble understanding how ...
1
vote
1answer
28 views

Is the Gravity Turn the most efficient way to put a spaceship into orbit?

The Gravity Turn is a maneuver used to put a spaceship from ground into orbit. It can be described as lifting the spacecraft vertically up, then tilting it towards the desired orbit by a small angle ...
-3
votes
1answer
71 views

What are the relativistic arguments for existence of space? [duplicate]

One of the interpretation of special relativity states that the time is an illusion and does not really exist. This interpretation promoted Einstein himself in his condolence letter after the death of ...
1
vote
0answers
21 views

Diffusion of a color through a liquid in zero-gravity environments

There's a video of an astronaut putting a droplet of food coloring into a blob (sphere) of water on the ISS. The water turns the color of the dye almost instantaneously. On Earth that dye would slowly ...
6
votes
1answer
149 views

What is in space?

I was recently on a chat server having a random discussion about science stuff and someone I was talking to then made the comment that "space is not a complete vacuum and it's full of plasma / matter"....
1
vote
2answers
47 views

Can space be compressed in an empty bottle?

On a spacewalk, in a vacuum, if an open empty water bottle were capped and squeezed, would it pressurize or collapse as if it were not capped?
-2
votes
1answer
61 views

Why human knowledge about small scale physics is growing much faster than knowledge about big scale phenomena? [closed]

According to Kardashev scale there are subzero types civilizations according to their expertise in small scale physics (e.g. nanotechnology), which are classified according to Wikipedia as: Type ...
3
votes
0answers
41 views

Ice formation in a cavity that was sealed at ambient condition and taken to space

I have a hardware with a cavity that was closed (welded) at ambient conditions (298K, 1 bar Pressure and 50% RH). The hardware was taken to space where the temperature can go down to near zero Kelvin. ...
0
votes
1answer
26 views

Fire-powered thrusters? [closed]

So recently I have been working on a science project for ideas that could possibly help in space expeditions, and one of my ideas would be a rocket that would be powered by flame, anyone here have an ...
2
votes
1answer
71 views

Is there something like a fixed absolute position in space

Imagine a spacecraft floating around and everything else in the universe gone. Could the people on the spacecraft figure out if they are sitting in one place or are moving in the nothingness without ...
0
votes
2answers
108 views

If a gyroscope is provided a torque in space, what will its motion be after the torque ceases to act?

As there will be no energy dissipation, where will the kinetic energy of precession go as the gyroscope can't precess in the absence of a torque? Thanks in advance!
1
vote
0answers
45 views

If Time and Space are intrinsically linked and space is ever expanding then surely time is slowing down [duplicate]

When we try to imagine the initial expansion after the big bang we see with the CMB that the universe went from initially smaller than a hydrogen atom to what we see today. However, when we try to ...
31
votes
1answer
3k views

Does more light from Andromeda get scattered in the atmosphere than in the entire trip to Earth?

Fires have been burning here in Northern California. Today there was just a slight haze of smoke. The sun had a slight red hue to it. As expected the lower it got the redder it became. The blue light ...
1
vote
0answers
94 views

How big of a Artificial Magnetic Field would be needed for Mars to be shielded at L1?

I was recently reading an awesome Paper that details a possible process for restarting the Martian atmosphere. The paper explains that a Sufficiently Sized artificial magnetic dipole of 1 to 2 Tesla ...
-3
votes
2answers
50 views

Could you generate a lot of electricity in space? [duplicate]

I was just thinking about the fact that if you threw a ball or any object out into space where there is no other forces or gasses it would continue on forever, so say you had a turbine and you spun it ...
2
votes
1answer
262 views

Can I avoid spaghettification with a spin?

I am aware of spaghettification effect caused by entering a black hole, as well as fundamental physics of an object in space, so here is my theoretical construct: if I place an object in space where ...
3
votes
0answers
46 views

Expansion of the time dimension [duplicate]

Given that the universe is expanding in the three spatial dimensions, is it possible that the time dimension is also changing over time? If the rate of the passage of time is changing over time, ...
2
votes
1answer
43 views

Motion Resistance in Space

I was reading this question on the Worldbuilding SE about stray bullets eventually hitting other things, like a space station or another ship, somewhere else in the same solar system. The consensus ...
1
vote
1answer
72 views

Does the big bang model describe a first momment in time for the entire universe or just the observable universe

The big bang model describes the universe as contracting as we wind time backwards. Since the observable universe is of a finite size this ultimately sets the first moment of time at around 13.8 ...
1
vote
0answers
35 views

Voyager golden disc would be affected if Betelgeuse explodes?

first of all sorry for my english, it's not my mother language. Well, my question is about the golden disc carried by the voyager and if it would become unreadable if betelgeuse explodes.
0
votes
2answers
67 views

Would it be possible to propel a spaceship by pushing against the sun's magnetic field?

Would it be possible to power a space ship by generating a magnetic field opposed to the sun's? For example, the spaceship could generate a magnetic field using massive coils of superconducting wire. ...
4
votes
1answer
114 views

Radiation cooling in space [closed]

Would the droplet cooling system from Mass Effect be actually possible in our universe? I'm interested in expanding the space industry and promote manufacturing in space. One of the biggest problems ...
0
votes
0answers
31 views

Defraction limits of muli-image super resolution for satellites

Is it possible to increase the resolution of satellite imagery with multiple passes through the use if multi-image super resolution algorithms? I would imagine that probably the optical systems are ...
0
votes
0answers
83 views

What is the the formula for pressure of fluid, filled in hollow sphere at Zero Gravity?

Consider a non motile(having no velocity) hollow metal sphere standing in outer space in absence of gravitational field fulfilled with fluid (liquid or gas), what be the pressure exerted on inner ...
2
votes
1answer
65 views

Does the entire universe contain photons? [closed]

Since light travels in all directions, and since there is an infinite source of light in the universe, wouldn't that mean that ALL space within the universe must be filled with photons? (and that ...
0
votes
1answer
156 views

Why space is dark? [duplicate]

There are trillions of stars like the Sun in our universe so "why is it space is dark and cool?" Well I really meant that our stars, giant balls of gases which exist by expelling huge amount of energy ...
2
votes
2answers
199 views

Are there places in space completely devoid of light?

I'd be interested to know how far from the sun you'd have to be for it to feel 100% dark, as the human eye sees it. But also, are there places in space so far removed that there is nothing visible ...
-3
votes
2answers
101 views

What's the maximum distance that a radio wave can travel at full power [closed]

If the sun is eight minutes away if you are travelling at the speed of light, since that's how long it would take for people to notice if the sun had stopped shining, how far can a short-wave radio ...
1
vote
3answers
45 views

Spacecraft acceleration - How fast could one possibly go without disintegrating?

Assuming we had a spacecraft that could accelerate up to 10% of the speed of light, what speed could be realistically reached without breaking its structure given current material science? Space ...
13
votes
1answer
3k views

Why does a metal bar in space in the shadow of the earth not go to absolute zero?

From what I can tell from reading various articles about space, a metal bar on the side of the earth exposed to the sun will heat up to about +250 °F (120 °C) and on the shadowed side will cool down ...
1
vote
1answer
40 views

Simplified formula for temperature between the star and background temperature

I am looking for a simplified formula to calculate the temperature of an object in space and how distance from the star affects said temperature. Something that closely represents reality will ...
-1
votes
2answers
77 views

How does spacecraft/rockets accelerate in vacuum while there's no gas present to apply force on in order to accelerate? [duplicate]

I don't know maybe it's a very stupid question I'm asking but that's the question which always disturbed me.
0
votes
1answer
48 views

Specific Heat Ratio

So I've been researching about designing a rocket engine, when I came across the specific heat ratio. I found on the Braeuig.us website that they were able to get a number by finding the heat capacity ...
1
vote
2answers
52 views

How can you work out the most efficient path of a space shuttle going into space, taking into account gravity and atmosphere loss?

Taking into account gravity and atmosphere loss acting on the shuttle, how would you be able to plot a graph of horizontal distance against vertical altitude of a spacecraft going into orbit? Could ...
2
votes
0answers
44 views

Is space not truly an empty vacuum but instead made up of densely packed particles of matter and antimatter?

In the livescience.com article Superpowered Chinese Lasers Could Soon Rip Open Raw Vacuum I read that quantum electrodynamics states that the vacuum of space isn't empty, rather it's made of densely ...
0
votes
1answer
52 views

Higgs boson in space!

Given the fact that the Higgs-like boson has an invariant mass of about 125GeV, could we detect Higgses from Outer Space as we detect photons, neutrinos, protons or cosmic rays? As the Space is the ...
0
votes
1answer
111 views

Asteroid hopping

Hypothetical situation: I'm an astronaut on a celestial object and another object is passing by, quite close to me. Could I jump to the other object? What are the two largest bodies of comparable ...
1
vote
0answers
53 views

Is the reversal of the movement of all particles in phase-space, the expansion of space and the development of quantumfields equal to time reversal?

In an earlier question, which was called a duplicate, I already asked a similar question. But I state my question differently now and add something to it. Suppose "we" would reverse the direction of ...
-1
votes
3answers
64 views

Can we use ions in space to propel and power spacecraft?

If space contains mostly ions (whether positive or negative), then why cant a spacecraft “absorb” them with simple anodes/cathodes, separate them, and repurpose the ions for spacecraft electricity (e-)...
1
vote
1answer
103 views

Can a negative kinetic energy exist in a non-Euclidean space?

A particle with mass $m$ and velocity $\vec{V}$ has a kinetic energy $T=\frac{1}{2}mV^2$. In an Euclidean space with Cartesian coordinates using Pythagoras theorem I can write the following $$T=\frac{...
0
votes
1answer
69 views

Can black holes slow down a planets time to months whilst millions of year pass elsewhere?

Writing some sci-fi and want to see how accurate I can get this. Let's say there's a planet (call it A) next to a black hole and then Earth somewhere far away. Is it in any way possible for the time ...
3
votes
2answers
88 views

What accelerates the solar wind?

The question is in the title. A bit of background info: the escape velocity at the photosphere of the Sun is ~ 620 km/s, but the mean speed of the solar plasma there (inferred from the temperature) ...
-1
votes
1answer
93 views

What is space according to quantum mechanics?

We have a pretty good idea what space is in general relativity, yet the strange fact of non-locality in quantum mechanics tells a different story. Interestingly enough this non-locality doesn't seem ...
0
votes
1answer
53 views

Would entropy increase even in the colder regions of the universe?

We know that entropy increases as temperature increases. However, in the colder regions of the universe, temperature is low. Does that mean entropy in the universe stops increasing as temperature ...
3
votes
0answers
138 views

What happens to your pulse rate when you are in zero gravity in space? [closed]

I am new to stack exchange, this is my first post. To start with, what happens to your blood pulse rate when you are in zero gravity? Does it increase or decrease? I thought a lot about this but am ...