If you see this it wont work.
Navigate
Click and drag to pan.
Use the mouse wheel to zoom in/out.

Simulation speed:
Faster = less accurate
Create Random Field

Create Galaxy
Click to place. Click and drag to set velocity angle and magnitude.
Use the mouse wheel to change the size.


Density:

Rel. orbiting mass:

Start spread out:
Add Body
Click and drag to set velocity angle and magnitude.
Use the mouse wheel to change mass.


Mass:
Combine masses on collision:

Show Barnes-Hut graph:

Theta:
(Higher = faster, less accurate)