Quote:
Originally Posted by grant hutchison
Sorry, it's a pleasing idea, but no.
The Sagittarius Dwarf has nothing to do with the Sagittarius arm: its central portion just happens to lie in the same direction as the Sag arm, but it's on the far side of the galaxy from us. It's trailing a big sparse spiral of stars as it is tidally disrupted by the Milky Way, but that spiral doesn't follow the spiral structure of our galaxy, as the diagram on the linked page shows: instead, it arches out of the galactic plane and then drops back in again at around our location.
Grant Hutchison
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I have looked briefly at that scenario before and realized that Sag/dwarf was on the opposite side of the galaxy and that if that were happening ~125,000 years from now, that it could definitely impact 'our neighborhood' in some pretty profound ways.
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?