Gravilux

Gravilux is a combination of drawing, animation, art, science, and gaming.
With each touch in Gravilux, you exert a gravitational pull on a world of simulated stars.

You can tease and twist the particles into galaxies, explode them like a supernova, or color the stars by their speed. You can change parameters including gravity, antigravity, number of stars, star size, and color.