Galaxy2 is program which simulates the motion of
stars under the influence of gravity. Create a field of
random stars to begin with, then watch the stars move as
they are accelerated by their mutual gravitational
attractions. Watch how the attractive forces accelerate
individual stars to send them in new directions. Watch
large groups of stars develop spiral arms over time.
Galaxy2 can be used as a learning aid for young students
This is a 3.7 minute video with several short
segments showing Galaxy simulations. The first segment has only
10 stars, so you can watch them pulling on each-other
and how their motions change as a result. The remaining segments
have increasingly greater numbers of stars. The last segment has
16000 stars and shows the end result after 10 minutes of
simulation - a spiral galaxy.