a galaxy cluster is started but stars pass by each other but they dont go boom
on the table
two of the same plates colide
No earthquakes do not only happen in flat surfaces. Earthquakes happen where ever two faults colide and the vibrations come through and cause an earthquake... (Hope this helps... this is all that i know...)
two tectonic plates colide
Gradius Galaxies happened in 2001.
They would become distorted due to gravitational affects
a cosmic colision is when two or more bodies in space colide
That's possible in principle, but extremely unlikely in our immediate neighborhood. Near the center of galaxies, that likelyhood increases, since stars are much closer together.
Star Wars Galaxies happened in 2003.
two tectonic plates colide
The two Magellanic Clouds are irregular dwarf galaxies.
the two types of galaxies that are barred and normal would be irregular as my best guess