All Questions
5
questions
2
votes
2
answers
305
views
Is blue light not traveling faster then red light in space?
I just can't understand why light and other massless particles are not traveling at different speeds?
Gravity effects anything with a mass but light has no mass but a black hole, and weak lensing ...
- 1
5
votes
1
answer
1k
views
How to determine the mass of a galaxy?
I am having a slight disagreement with my professor.
We can measure the mass of a distant star cluster from:
A.Its color
B.Its radius
C.Its metallicity
D.Smearing of lines in its total spectrum
My ...
- 67
8
votes
2
answers
312
views
Can "rogue" supermassive black holes be made this way?
Could two galaxies (one big and one small)intersect at a velocity to allow the smaller black hole to escape but not the galaxy around it?
- 1
2
votes
2
answers
513
views
Circular velocity in axisymmetrici potential [duplicate]
If a matter distribution is spherically symmetric, the circular velocity is straightforwardly related to the mass via:
$v_{circ} = \sqrt{GM/r}$
In an axisymmetric potential, on the other hand hand, ...
- 844
-2
votes
1
answer
81
views
If velocity is relative, why mass (inertia) is increasing absolutely? [closed]
Would inertia not grow if we took out the reference frame?
- 1