As something "astronomyish"; a few weeks ago I took the C# Express screen saver starter kit and made a "gravity simulator".
Originally Posted by The_Radiation_Specialist
When the saver starts up, some objects with mass appear on the screen, and they all start attracting each other and flinging all over the place. I find it relaxing to look at.
If you are interested, PM me and I'll email you the code.
You can tell me how badly I messed up the gravity-force-acceleration maths.
(I'm a C# programmer by trade, but this was a lunch-time hack, not a carefully crafted sample.)
Get up, a get-get, get down.