Stars the size of our Sun... as massive as they become, go out with a whimper. They become unstable the second they begin to produce iron. As fusing iron doesn't provide the energy needed to maintain the star's constant battle against gravity.<quoted text>
Interesting points you make. Black holes certainly are mysterious, eating anything and everything around them. That kind of density and power is truly awesome. What eventually happens to a black hole? Do they implode and become a super nova? Incredible to even try and imagine. Maybe one day we'll have all the answers. Then again, if we had all the answers, what would we do? Ha! Anyway, I'm off to the sack. Have a good one. Enjoyed the little chat.
The Star then goes into it's "death throws". Kind of like a human that can't seem to breathe... they convulse. Our Sun will fight it's fate with everything it has.(That is a lot.) It will expand to the point where the surface of the Sun will swallow Mercury and Venus. It will come close enough to the Earth to sterilize it... nothing but rock left.(If it doesn't swallow Earth as well.)
Then it will cast off everything but it's core in a mighty explosion (including all of the elements it has created) and live for another few billion years as a brown dwarf star. Warm, dim... unimpressive.
Stars that are much bigger than our Sun... bare minimum of ten times larger... are destined for something more spectacular. As they are large enough that when they begin to fight for their existence they are strong enough to overcome gravity and the result would be a supernova. Which creates the less common heavier elements such as gold.(So if you have a gold ring... appreciate that it was forged in a supernova.) These explosions leave behind quickly rotating balls of (mainly) neutrons called Pulsars.
Stars that make those look like chumps... the ultra huge stars (At least 25 times larger than our Sun.) are even more powerful... but they are so heavy that gravity prevails. They collapse into themselves and give birth to black holes.
Black holes are objects that have an escape velocity greater than the speed of light.
As far as we know... they are immortal. They eat supernova type stars for breakfast. As long as they don't run into a heavier black hole nothing can stop them. But without black holes... we would have no galaxies. Just as the planets revolve around the Sun... billions of stars rotate around super massive black holes. The closest one we have found resides smack in the middle of the Milky Way.