I Andromeda vs. Milky Way galaxies

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The discussion centers on the contrasting sizes and masses of the Andromeda and Milky Way galaxies, with Andromeda being larger in diameter but lighter in mass. Questions arise about Andromeda's classification as a Low-Surface Brightness galaxy and the implications of its heavier central black hole compared to the Milky Way's. The upcoming collision between the two galaxies, expected to form "Milkomeda," raises concerns about how their differing densities will affect their structural integrity during the merger. Additionally, the visibility of Andromeda is attributed to its contrast against the dark sky, while the Milky Way's extensive spread makes it less defined visually. The conversation highlights the complexities of galactic interactions and the ongoing research into their dynamics.
  • #31
I don't know about that. See, I'd count cosmology as being in the high-precision bucket. Especially since I tend to think of CMB data as its cornerstone, more so than anything local.
Anyhow, last time I heard Reiss give a talk (online, not in person), it was a CfA colloquium about getting the precision of local H0 measurements down to 1% or something. He did mention the systematic issue with different instrument being used to collect data for same SNIa events, but in the context of past practices as opposed to his team's current effort.
But then again, I have no hands-on knowledge on how the sausage is made.
 

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