colliding galaxies

The  result of two galaxies  crashing into  each other  middle aged hefties  with a total attraction   to  each other. The  andromeda galaxy is headed  straight   fro the  milky way. We're  the  biggest crunch  you'll  ever see. Lumbering  galaxies  weighing many millions of suns sometime smash into  each other. Drawn  toward each other  by their  huge gravity the outcome  is inevitable. It's  a car  accident in  the sky!  The force of  the from  impact make  us turn cartwheel  and  form lovely spiral arms. Then after a burst  of star birth all  the gas is driven off. merging galaxy arp 273 collision speed up to 186 mi (300m) average time  to merge one billon year without gas  old galaxies  look blobby  don't  make new stars. called the astronomy out of this world.