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When two galaxies collide, material swirling in the vicinity is pushed into each of the central black holes, letting out high-energy radiation and giving rise to what’s known as an ‘active galactic nucleus.’
In some galaxies, known as "active galactic nuclei" (AGN), the nucleus (or central core) produces more radiation than the entire rest of the galaxy!
At the 230th meeting of the American Astronomical Society, Benjamin Hoscheit and Amy Barger (both at University of Wisconsin, Madison) presented a possible workaround. What if, they proposed, the Milky Way lives in a cosmic void? That could skew the measurements of local stars and supernovae, but it wouldn’t affect the faraway CMB.
originally posted by: Kashai
a reply to: lordcomac
See if you think that it is impossible for mankind to exist for billions of years where there knowledge of history dates back to when humans first walked upon Earth?
What exact position are you taking that explains otherwise?
Moving the galaxy would require producing a gravitational field at a location away from the Milkyway that would be strong enough to pull the galaxy away without also pulling Andromeda in exactly the same path. This is, even as a thought experiment really quite problematic.