Black Holes or Galaxies: Which Came First?


by Ethan Siegel

What came first, the black hole at the center of a spiral galaxy (drawing material to itself), or the galaxy first then the black hole?

We’ve recently looked at both the largest and the smallest black holes in the Universe, and this gives us the wonderful opportunity to look at the order in which the different structures in the Universe formed. On the largest scales,this is what the Universe looks like!