# Dynamics

From PGSC Wiki

Questions in this category have been asked by

- What do you know about the galactic rotation curve?
- How are distances measured on it?

- What's dark matter?
- How do we know it exists?
- What is the dark matter fraction for the MW? Universe? Why the difference? (MT)

- What is the circular velocity of the sun around the galactic center? What is its distance from the GC? Orbital period?
- Plot the position of the sun on a galactic rotation curve
- How will u estimate the following WITHOUT using the Jeans equation: radial dependence of the density of dark matter, the amount of DM in the local neighborhood
- Does the virial theorem hold in General Relativity?
- How did Zwicky find dark matter? What method did he use?
- How is the Jean's wavelength derived from the Boltzmann Equation? What is the Jean's Swindle?