text: The Sombrero Galaxy may have a smooth &quot;brim,&quot; suggesting that its past was free of any galactic collisions, but new data from the Hubble Space Telescope has shown that this seemingly unscathed galaxy is hiding a violent past. According to NASA, the galaxy&#39;s faint outer halo provides some forensic clues that suggest the galaxy underwent multiple collisions with other galaxies billions of years ago.