All Questions
5
questions
3
votes
1
answer
234
views
Why are there no more galaxies moving as relativistic speeds?
Introductory note: I am not discussing galaxies that are going away from us or that are at the border of the universe.
If there are no preferred frames of reference, no galaxy or matter ensemble can ...
- 5,568
1
vote
1
answer
682
views
Calculating velocity in particular reference frame given redshift
I am trying to do some analysis of galaxy velocities within cluster environments. This involves finding the velocity of that galaxy with respect to the cluster-frame, or the "proper velocity", $v_i$. ...
user97626
1
vote
1
answer
86
views
Are the edges of a galaxy moving inwards?
Space is expanding, but as I understand it, galaxies are not since gravity keeps them together.
If you think of space becoming bigger, your galaxies just become further apart. But taking the size of ...
- 129
3
votes
2
answers
1k
views
Frame dragging -- is there a "non-tiny" example?
Now. As I understand it, in fact, the earth (10^25 kg) creates a very small, very tiny, frame dragging effect. Indeed, we have measured this using satellite experiments.
So, the Earth (10^25 kg) ...
- 994
4
votes
6
answers
789
views
Why are distant galaxies not actually tiny bits of matter?
Distant galaxies are said to be moving away from the Milky Way (and us) at speeds approaching the speed of light. Since Special Relativity tells us that any object moving away from us at a velocity of ...
- 59