Today was the Big Apple Colloquium, with Amina Helmi (Groningen) presenting on Gaia results relating to Milky Way dynamics. I don't love the chemical arguments she gives that the observed halo stars must have come from a single progenitor; since we know that nucleosynthesis is pretty low-dimensional, all merging progenitors might lie on very similar chemical tracks. But the data do show great evidence of merging and non-equilibrium dynamics in the disk and halo!
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