Tagged Questions
5
votes
3answers
81 views
What causes the permittivity and permeability of vacuum?
When light travels through a material, it gets "slowed down" (at least its net speed decreases). The atoms in the material "disturb" the light in some way which causes it to make stops on its path. ...
3
votes
1answer
76 views
Influence of air resistance in space
Consider the following situation:
You are locked inside a cylindric container allowing you to move around freely without being in contact with any of the items or surfaces aboard. The container is ...
1
vote
3answers
192 views
Can one heat up a vacuum?
I've got a question about heating a vacuum. If there were, say, a container in space, at 2.7 degrees kelvin (the typical temperature of space, if I'm not mistaken) and as empty as space (as close to ...
2
votes
2answers
196 views
Speed of light in a vacuum
I see many references to the speed of light in a vacuum implying that it is only truly a constant measurement in a vacuum. I can live with that, but what kind of vacuum?
Are we still talking about ...
1
vote
5answers
574 views
Is there perfect vacuum 10000 billion lightyears away?
Is there perfect vacuum about some 10,000 billion light years away?
With perfect vacuum, I mean that there are no particles, not even virtual photons!
I had this idea by assuming that all particle ...
10
votes
1answer
131 views
How long will our artifacts last in moon & space?
Given all the different space probes and equipment that have been either launched into space or lying on the moon. How long will they last before they get decayed into dust or some unrecognizable ...
0
votes
3answers
370 views
Will a stone thrown in space move forever?
If I throw a stone on space, in a place where gravity is equal zero, will the stone move forward forever, because no air, so no friction?
0
votes
1answer
94 views
Understanding particle's space travel
Before the discovery of dark matter, the prevailing popular understanding of Space content is that of celestial bodies (planets, stars..etc) floating in 'void' and emitting particles and waves ...
2
votes
1answer
242 views
Calculating spacecraft water leak flow rate
A large container of heated water is floating in space. How can I calculate leak rate if a small puncture is opened?
I'm assuming the water is kept at 298K and in the liquid state inside the chamber.
...
3
votes
3answers
69 views
What's in my box?
Let's say that I have a box which is 100% empty.
I fly into the vacuum of space, open the box and close it after a certain time.
Then I go back to earth and my question is..
What's in my box? ...
14
votes
2answers
2k views
How does space affect the human body (no space suit, no space craft)
How does "outer space" affect the human body? Some movies show it as the body exploding, imploding or even freezing solid.
I know space is essentially a vacuum with 0 pressure and the dispersion of ...
1
vote
1answer
415 views
Would a high-explosive in a vacuum be less harmful?
Putting aside shrapnel effects, I believe that high-explosives cause damage by producing a shockwave. How do shockwaves work in space? I've managed to convince myself that a high-explosive shockwave ...
6
votes
4answers
181 views
Direct exposure to the vacuum of space
I was watching a few sci-fi movies and was wondering the real science explaining what would happen if you were to be subject to the conditions of outerspace.
I read the wikipedia article on space ...
3
votes
1answer
325 views
Effects on a tree exposed to the vacuum of Space
My wife's kindergarten class asked, "What would happen to a tree planted on the moon?" Aside from the obvious that it would die from lack of water/air, what physical effects would happen to a tree ...
0
votes
6answers
3k views
Does vacuum (empty space) exist? [closed]
Added: 5 times down vote for now! Down voter is this religion or physics, please try to explain your decision.
I'm confused about this.
In physics we know for a vacuum, but I think that there is a ...
4
votes
2answers
444 views
“Space” in General Relativity and “vacuum” in Standard Model, is it the same thing?
And expansion of space is equal to expansion of vacuum?
9
votes
6answers
982 views
Does anything exist in the intergalactic space?
I am a part time physics enthusiast and I seldom wonder about the intergalactic space. First, it is my perception that all(almost all) the objects in the universe are organized in the forms of ...
