This java applet simulates colliding (or rather, "interacting") galaxies. The main point is to show the development of a structure similar to the antennae.

Instructions are given below. If it doesn't work you may need to update your Java plugin.

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There's not much you can do except sit back and watch. Switch some views off to make it run faster. Zoom views in for a closer look. The original plan was to add some controls to adjust the galaxies initial mass and velocity too.