All Questions
12
questions
194
votes
15
answers
31k
views
Why does space expansion not expand matter?
I have looked at other questions on this site (e.g. "why does space expansion affect matter") but can't find the answer I am looking for.
So here is my question: One often hears talk of space ...
- 2,055
50
votes
8
answers
7k
views
Why isn't dark matter just ordinary matter?
There's more gravitational force in our galaxy (and others) than can be explained by counting stars made of ordinary matter. So why not lots of dark planetary systems (i.e., without stars) made of ...
- 603
23
votes
1
answer
9k
views
How do we know Dark Matter is non-baryonic? [duplicate]
It seems widely stated, but not thoroughly explained, that Dark Matter is not normal matter as we understand it. Wikipedia states "Consistency with other observations indicates that the vast majority ...
- 3,241
2
votes
1
answer
488
views
Is the expansion of space universal or local?; does matter impede the expansion of space?
Michael Strauss in his recent book "Welcome to the Universe" with authors Tyson & Gott describes that space is NOT expanding within galaxies but rather between galaxies. So then the expansion is ...
- 11.7k
5
votes
3
answers
2k
views
Creation of matter in the Big Bang
I appreciate your patience to my neophyte question. I am working on my dissertation in philosophy (which has nothing or little to do with physics) about the "problem of naming." Briefly what ...
- 59
12
votes
2
answers
2k
views
What is the physics definition of space?
When astronomers, physicists say that space is expanding, does the definition of space include matter, energy and the particles within?
Or is space an empty 'stage' in which all of the above exist?
...
- 11.7k
6
votes
4
answers
598
views
Which one is more fundamental in nature: matter or radiation?
I am following a geometric perspective on abelian gauge theory as done in the lecture notes by Timo Weigand, chapter 6, pp 165-167, here:
http://www.thphys.uni-heidelberg.de/~weigand/QFT1-13-14/...
user56963
5
votes
3
answers
237
views
Cosmological Inflation: If Photon expands, why not other matter?
I keep repeatedly reading in many Stack Exchange and Quora questions that space of universe expands but particles (matter) don't, see e.g. this Phys.SE post. The reason given is that particles are ...
- 149
3
votes
1
answer
567
views
What is the difference between matter & spacetime? [duplicate]
If the universe is expanding why doesn't the matter in it expand proportionally making it seem as if the universe is static? Alternatively, as spacetime expands why does it not just slide past matter ...
0
votes
1
answer
54
views
Is there scientific evidence that point towards the cause of differently distributed matter through out the Universe? [closed]
If we know from discoveries from cosmology prove that ordinary matter and dark matter are still not enough to explain the structure of the universe and its distribution of matter. There should be a ...
- 13
0
votes
1
answer
104
views
Are there other theories than gravitational attraction taken into account as a reason for the extreme accumulation of matter in the universe?
This question is about how small the interstellar density is (less than 1 atom per cubic centimeter).
But although the interstellar density is very low, matter tends to extremely aggregate in certain ...
- 282
-1
votes
1
answer
87
views
Does the expansion of the Universe cause internal stresses in solids (and other substances with similar internal resistance forces)? [duplicate]
Is my understanding correct?
Weren't it for the internal resistance forces between particles in a solid object, the expansion of the Universe would continuously increase the distances between all of ...
- 245