Quote:
Originally Posted by RussT
Are you saying that they have been able to determine where Sag/dwarf was ~125,000 years ago robustly enough to ~know where it will be ~125,000 years from now?
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I'm not saying that, though it might be true for all I know.
But what is being reported is that the tidal trail of stars pulled out of the disintegrating Sagittarius dwarf galaxy is visible in the 2MASS data, and it exists as a sparse arch from one side of the galaxy to the other, passing through our current neighbourhood.
You can look at the data yourself, in a 3D flyround, at the bottom of
this page.
Grant Hutchison