Supermassive Black Hole

YO! So I was listening to some Muse (Cause they're awesome!) and in one song, the term supermassive black hole came about. I had absolutely no idea what that meant thus I performed a thorough research - and what I found is truly mind boggling. ------
A supermassive black hole is a black hole with a mass of an order of magnitude between 105 and 1.8x 1010 solar masses. Most, if not all galaxies, including the Milky Way, are believed to contain supermassive black holes at their centers. The average density of a supermassive black hole (measured as the mass of the black hole divided by its Schwarzschild volume) can be very low, and may actually be lower than the density of air. Although it isn’t as dense as a regular black hole, it can still have enough powerful gravitational field to pull ANYTHING into its mist. Awesome isn't it?! Astronomers have discovered several dozen likely "supermassive" black holes in the cores of fairly nearby galaxies – some of which are found in the Milky Way Galaxy called stellar-mass black holes (Low mass). There are various theologies about black-holes leading to another universe or its appending doom to our universe, but nonetheless, it just blows my mind. As I continue my study of black-holes, I begin to wonder; just what did God had in mind when He created them. Was there a purpose for them? What are they really? THIS IS JUST SO FASCINATING!!