Acting like CSI sleuths, astronomers have been able to unravel the history of galactic collisions from new images of the Antennae galaxies, Arp 220, Mrk 231 in the Big Dipper and 10 other well known colliding galaxies. “The new images allow us to fully chart the orbital paths of the colliding galaxies before they merge, … Continue reading "Tidal Tails are “Skid Marks” From Famous Galactic Collisions"