Re:Astronomers see a black hole awaken in real time
by AnimalMuppet on Wednesday June 19, 2024 @12:47PM
(#40729973)
So, yes, we think there is a massive black hole at the center of all (or just spiral?) galaxies. And gravitational waves move at the speed of light, so if something changes the mass of the central black hole, and the galaxy has a radius of 25,000 light years, it will take 25,000 years for that wave to propagate out to the rim of the galaxy, rearranging things along the way. But:
1. The massive, central black hole did not come from a supernova. There are no stars anything like that big.
2. Even if there were a huge central mass and it collapsed, that doesn't actually change the mass distribution as far as the rest of the galaxy is concerned. There is very little change to propagate. The existence of the huge central mass would have already "arranged" the galaxy.
3. Galaxies spiral with curved arms due to their own rotation, not due to the universe's rotation. If the universe were rotating like a disk (and that was causing the spiral of galaxies), then you would expect the spin of galaxies to all be aligned. And they aren't; not at all.
1. The massive, central black hole did not come from a supernova. There are no stars anything like that big.
2. Even if there were a huge central mass and it collapsed, that doesn't actually change the mass distribution as far as the rest of the galaxy is concerned. There is very little change to propagate. The existence of the huge central mass would have already "arranged" the galaxy.
3. Galaxies spiral with curved arms due to their own rotation, not due to the universe's rotation. If the universe were rotating like a disk (and that was causing the spiral of galaxies), then you would expect the spin of galaxies to all be aligned. And they aren't; not at all.