Effects of Collisions
Stars pass �through� each other, although orbits disrupted
Gas clouds collide
Gas stripped away from stars
Collisions cause bursts of star formation
Ellipticals may be galaxies which have suffered collisions
Spirals may be galaxies which have not suffered collisions
Joshua Barnes (Hawaii) and the Space Telescope Science
Institude provide a simulation of the Antenna Galaxies:
http://imgsrc.stsci.edu/op/pubinfo/pr/1997/34/images/anima.m
ov