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Is it possible that the other 50 percent of missing antimatter comprises the matter inside the black holes at the center of a galaxy?
One of the unsolved questions about our Universe is why it is composed almost entirely of matter. In our understanding of our Universe, the ratio of matter to anti-matter should be about 50-50. Saying, "All the anti-matter went into the super-massive black holes (smbh) at the center of galaxies" doesn't solve very much. It just leads to the question, "Why did only anti-matter go into smbh, and not matter?" There is SOMETHING about our Universe that favors matter over anti-matter. We just don't yet know what that something is. Simply saying that it is something that makes anti-matter, but not matter, go into smbh doesn't really solve much.
What do black holes orbit?
No. There are no black holes in our solar system. Based on current models, the smallest stellar mass black holes are at the very least about 3 times the mass of the sun. Therefore, if there were a black hole in our solar system the sun would either orbit it or the two would orbit about a common center of mass.
Can galaxies die?
We have not been around long enough to find out, but the only viable proposal to emerge so far is the Minkowski/Jackson/Whiffen model of recycling and evolution. This invokes active galactic nucleus (AGN) accretion (SMBH) and re-ionization of matter, which is re-emitted in quasar 'gas flows' or relativistic jets (Look up M87 or Centaurus A). Which then form new open spiral galaxies due to the intrinsic rotation of bodies in space to a virial radius. This is evidenced by the massive population peak of quasars at z= ~1.7, a few Billion years ago, coinciding closely with the age of the sun and older stars in the Milky Way, (and of course the lack of galaxies full of dead stars) and apparent correlation with the re-ionization of all below hydrogen. Such models are very unlikely to become part of mainstream science as irrefutable evidence is difficult to find and then change views with. no a galaxy cannot die rather it gets deteriorated bcoz of the expansion of the universe
