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.

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Is a photon really a moving object or is it caused by momentum exchange between parts of a immense 3D Newton cradle? [closed]

I was interested in watching how dominos fall as part of a hugh series of them arranged that the effect can be transferred. Very simmilar is the Newton cradle where objects that are strictly localised ...
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Volume of fundamental unit of discrete space and expansion of space

In this video, the following is said between 06:07 to 06:38: Now one of the interesting questions is how do you get from the quantum of space and time to Einstein’s theory of general relativity? It’s ...
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Magnetic acceleration for a spacecraft [closed]

This is a naive question about a shower thought, but perhaps someone could indulge me since I don't understand the physics at a sufficient level to know why it would not work. Could the ...
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Vector space vs affine space in Lagrangian mechanics

I want to know why is it preferred that the classical universe is seen as an affine space instead of a vector space? From my understanding an affine space violates the zero vector in the vector space. ...
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If the ion trail behind a spacecraft were not neutralized by its electron gun, what would happen?

In the Space Exploration SE question Is there any possible reason to direct the electron gun specifically towards the ion trail behind an ion thruster? there is somewhat of a consensus that there isn'...
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Why is the transmission data rate between Mars and Earth so low?

I read that we get between 500 and 32k bits per second when sending data from Mars to Earth. Apparently it's substantially higher between Moon and Earth. What are the reasons? Please explain the ...
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Why doesn't the force of gravitation on the earth due to the Sun change?

Since the earth moves around the sun in an elliptical orbit and the sun is located at one of the foci, hence the distance between the earth and the sun continuously changes, so why doesn't the force ...
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Is heat transfer in space through radiation 100% efficient?

Flat 1x1 meter plate. Heat source indicated by red arrow. The rest is in space. No sun exposure at all. Some of the photons will exit through the gaps between plates. No problem. My question is ...
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How far away from Earth would we have to be so that an object released in space would not fall to Earth

Suppose we had a bowling ball that we took to space. Also suppose we stopped completely and released the ball. At which point would the gravitational pull of Earth be so weak that the ball would not ...
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A question about the recent study that supports the Holographic Principle

First off, I agree with Susskind. There's no way to get around the Holographic universe. Maybe there will be one day, but each year it gets stronger and stronger. There's simply a limit to the ...
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Anyway to be alive after universe ends? [closed]

We know the universe has end or loop. Popularly there are $3$ ways for it. So we can not stop it but can we maybe escape from it? Edit: Ikr it looks IMPOSSIBLE. But isn't there ANYWAY?
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Will a pendulum oscillate on the ISS?

A question I encountered is whether a pendulum undergoing SHM on earth will oscillate on the ISS. Apparently the answer is it won't due to no effective gravity. The argument is there will be no ...
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If you were to fire a laser or maser into space, how much of its energy would be lost to the atmosphere?

I'm very interested in knowing about how much energy would be lost to the atmosphere if you fired a laser or maser into space. I know the laser would probably diverge quite a bit over that distance, ...
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Does Time Require Matter to Exist?

I've heard that General Relativity entails matter (or mass) is necessary for time to exist. However, there are vacuum solutions where the universe is empty of matter but still has spacetime. P.s: I'm ...
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where do the gases such as hydrogen and helium end up after leaving the earths atmosphere?

I've heard that gases like hydrogen and helium leak out of the earth's gravity a little by little. but where are they going? where do they end up after leaving earth's pull? would the sun pull them ...
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Mars Artificial Magnetic Field Generation questions AND orbiting scattered cosmic ray blockers

First is there any materials or superconductors that naturally generate a magnetic fields on contact with cosmic rays or high energy particles has this even been looked into? second MARs has two ...
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Orbital mechanics: how to calculate thrust turn on/off moments and direction for moving from point A to point B in gravitational space?

We have few planets and object. Object wants to move from point A to point B. Part of way it will just fly without any gravity impact, part it will move by orbits. 2D case, view from top, newtonian ...
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How to calculate thermobaric heating and decelleration when object go from space into atmosphere (2D)

I'm making 2D game where ship landing from space to planet. I want to add atmosphere to planets with gradient density depending on height. And I want to use this atmosphere for converting object speed ...
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Conflicting Information Regarding Pure Torque on a Body in Free Space

I have read two very similar yet conflicting threads on this site involving a pure torque applied to one end of a floating body in free space (no air resistance). Torque applied off the center of ...
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What causes an atom to move to a vacuum?

Im in no way an expert in physics but I've been thinking about this for a while. What force makes something move to a vacuum? For example imagine shooting some ice cream into space (lets say it ...
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Why can atmospheric re-entry heat up the air into plasma?

The adiabatic processes of re-entering earth from a spaceship, creates intense heat. Heat in the range of 1700-2000 degrees Celsius. I've read the the temperature in the air molecules generate a ...
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What goes in what spaces in LQG?

I read again the first chapter of Rovelli 2005 quantum gravity book, and I am still puzzled by the different spaces for each concept. It seems spin foams inhabit Hilbert spaces. But i read elsewhere ...
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Probability that the Hubble space telescope hit by Meteoroids

What if Hubble Space Telescope or International Space State hit by micrometeoroid or meteoroid? Asking because these objects are moving at a very high velocity.
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Displacement of “Space” [duplicate]

To the extent that matter has volume, is that volume permeated by "space", or does matter displace the "space" it occupies? I understand that limiting factors and conceptual issues abound in the ...
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Why does hot air balloon rotate with the earth?

This might be a silly question but I have been wondering this for quite a while. When a hot air balloon is flying in the sky, the earth is rotating at the speed of 1000 mph. Why does it move along ...
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Do empty space have momentum since uncertainty principle forbids 0 energy at any point?

I like to know do vacuum space have momentum due to quantum fluctuations?
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What is the difference between architecture of buildings in zero gravity and on Earth? [closed]

how is the architecture of buildings in zero gravity (space) different from buildings on Earth. like there is no concept of floor and ceiling in zero gravity so how are the buildings or spaceships ...
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Atoms with energy differences corresponding to wavelengths 19.05 cm, 24.45 cm and 25.48 cm

I was just wondering whether there are any known atomic transitions in Oxygen, Nitrogen, Hydrogen or Helium atoms/ions which emits wavelengths in any of the regions: 19.05 cm, 24.45 cm and 25.48 cm. ...
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Can we change the trajectory of a body in space using external means?

Suppose a block of metal is floating around in space....can we change its trajectory by external fields?Is it possible if yes then by what type of waves?
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Hybrid torus as an active space radiation shielding

Lately, I was studying the possible methods for protecting astronauts and onboard equipment in a spacecraft from space radiation which mainly comprises solar particle events (SPEs) and galactic cosmic ...
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When Measuring Altitude for a High Altitude Balloon does Temperature Matter?

When I look at the High Altitude Ballon results from people online that have launched DIY balloons (that have posted their data) I can see that their claimed top altitude (based on the pressure they ...
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Can astronauts experience “Hot sauna with cold plunge” in outer space?

I was reading an answer from a NASA scientist, that the sun facing side of the spacesuit could reach temperatures as high as 121 C, and the dark side, upto -157 C. (https://www.quora.com/How-do-the-...
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What is actually breaking the ozone layer?

My question is about the ozone layer. Is it possible that sending rockets out to space can damage the ozone layer?
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What is the total mass of orbiting interplanetary unbound atoms in the solar system?

Excuse the poor phrasing of the title, but it became apparent to me that the solar system has some degree of density (i.e it is not a perfect vacuum). So my question is if any of these particles (not ...
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How to simulate an explosion in space [closed]

I have a simulation of some bodies orbiting each other in space, and I would like to add explosions to it to see how the behave, but I don't know how to do it. Sorry if this is has been asked before, ...
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Physical meaning of angular spectrum

I have been going through the paper Diffraction from an irregular screen with applications to ionospheric problems. H.G. Booker, J.A. Ratcliffe and D.H. Shinn. Philos. Trans. Royal Soc. A 242, 579 ...
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Variation of phase across the wavefront

I have been going through the theory of diffraction of radio waves when passing through the ionosphere, when I came across the following statement: the amplitude of the wave when it emerges from ...
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Reaching outer space using earth's air pressure, then rockets

Please correct me in my methodology if I am wrong, I am only in Physics I right now... This question has been daunting me for some time, but wouldn't it be a whole lot more efficient to send cargo ...
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How would a nuclear explosion really operate in outer space?

(Repost from RPG.SE, per the community's suggestion.) A friend recommended I post this question here - said I'd be more likely to get a useful response than, say, from Reddit. My question is: How ...
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How can we use the vacuum of space to transport people to space like a vacuum cleaner?

Ignoring the challenge of making a 100 km long tube to space, here's the plan we will need a 100 km long tube and at least a meter wide or less A base which will do the job of creating a vacuum in ...
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How far can radio waves travel in vacuum? and light waves?

Radio wave and light wave are the same thing. They all are electromagnetic radiation, the only difference between them is frequency. My question : 1, is there any photon-like thing for radio wave? 2, ...
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What would it look like to be inside a small space with positive curvature?

Say you're floating in an empty void with a light source. The space you are in has a positive curvature, so going forwards will bring you back to the place you started after about 20 meters. What do ...
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Apparent temperature of the universe at relative speeds

Suppose you are in a vessel traveling at relativistic or near relativistic speed relative to your local galaxy--whatever is physically reasonable, and won't get rapidly torn apart by high energy ...
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Modeling the distance between two point masses in space with gravity as a function of time

Assume that there exist two point masses in space, an isolated system with only gravity acting. I wish to find the distance between the masses as a function of time. I have arrived at the result of $$...
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Configuration space VS Euclidean space [closed]

Why Configuration space is non-Euclidean space? Why it doesn't look like an n-dimensional Euclidean Space in General? Thanks
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What would happen to the water bodies if gravity ceased to exist on Earth?

If water stopped flowing (it would stop flowing downwards from mountains and all) then, would it start rising upwards? If it floats on the space ( I say space because there'd not be any atmosphere) ...
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Materials with good thermal insulating properties

I'm doing a research for a university project. In particular I'm looking for a "commercial" material (so a material that is available on the market or can be home made) that has good thermal ...
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Force required to propel mass in vacuum [closed]

I'm not mathematically inclined. At. All. I'm a massage therapist and mental health provider. I am, however, writing a book that takes place in space. My main character (MC) is 4'11" and weighs 95#/~...
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Coordinate axes, convention, and the isotropy of space

Say something has cylindrical symmetry so I align it on an axis to take advantage of that symmetry (this will make things like calculating the volume of a cylinder much easier if the $z$ axis pierces ...
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Lasers to direct waste heat?

I've been thinking about ways to cloak ships in space, since they all are warmer than their background they can be seen in the IR spectrum (given a large enough telescope). So I was thinking, could ...

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