On Friday, November 10, 2017 at 9:32:35 PM UTC-8, palsing wrote:
On Friday, November 10, 2017 at 8:39:01 PM UTC-8, Greg Goss wrote:

I thought that an extremely large (by mass) black hole is at the heart
of every full-sized galaxy.

I think that is pretty much how the thinking goes, although I don't know if the phrase "extremely large" is accurate or not...

http://www.cosmotography.com/images/...ution_2.h tml

This is an interesting article...

There are close to 3 trillion failed stars in the universe.#1 reason iron.#2 not enough hydrogen. TreBert