All Questions
4
questions
0
votes
1
answer
145
views
can i use heliocentric velocity as a rotation speed? [closed]
In the research of the galaxies, does heliocentric velocity involves space's expanding velocity? and can i use heliocentric velocity by galaxy's rotation speed?
- 33
6
votes
2
answers
1k
views
Why most planets don't spin retrograde? [duplicate]
Edit: just found duplicate
Since orbital velocity is greater on small orbits, and smaller on large orbits, why don't planets spin retrograde around their own axis?
One portion of planet's mass is ...
user16500
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
8
votes
1
answer
573
views
Which celestial object in the solar system has the fastest tangential velocity at its surface?
Consider all of the naturally-occurring objects in the solar system : in the reference frame of the object's center (ie, ignoring the orbital velocity around the sun or, in the case of satellites, ...
- 748