It's space. Glide your mouse over the screen to move the stars and control the speed of the planets. Hold mouse to pause. Full screen recommended. Turbo Mode, not so much.
Just for fun. Kind of like a screensaver. Update History(scroll down): v1.0 - Shared v1.2 -Added light effects to planets v1.4 -Bug tweaks -Added pixelate effect -Planets now have random colors, satellite becomes randomized -Added hold mouse to pause v1.6 Added mouse-moving effect to planets, they move with the mouse just like the stars