Comment Re:Is this a place where a SuperNova once happened (Score 1) 17
"As for individual solar systems, according to what I just looked up, stars fizzle out and become either a white dwarf, or (for massive stars) a neutron star or black hole - but not again a star in any case."... I think that is interesting but is not intuitive to me. It is like a bunch of dust floating around, mostly hydrogen, just collapses in on itself and becomes a solar system. It seems strange. As for the "Big Crunch" theory, I have lots of thoughts about that, but I think it is still in the running as far as theories go. Apparently space can expand quickly, like at the birth of the universe, maybe it can contract quickly, and we can still have a "big crunch"?? I am also doing mind experiments as to if we look in the opposite direction to the big bang, what should we see? When we look at the big bang, we are seeing back in time, and seeing things that happened 13 Billion or more years ago. What happens when we look in the other direction?
I keep recommending this book, because it's a very humorous look at all the possible ways the universe may end, but you should check out Katie Mac's The End of Everything, Astrophysically Speaking. While the Big Crunch is still a theory, it's not a highly favored one in her view. Far more likely to current thinking, heat death will take us, where everything in the universe becomes so spread out that there's not enough matter in any one place to keep generating energy, in extremely simple terms. But there's also some extremely interesting options, like vacuum collapse. Or other "starts somewhere and travels at the speed of light, leaving nothing in its wake" options.
A shockingly light-hearted read, for a book about how everything in our universe will one day cease to be.