This is an interesting idea, and I hope work will continue to confirm or refute the idea that the Solar System is not part of the Milky Way.

There is little doubt that galaxies collide, and that Hydrogen-fusion is not the primary energy source for the Sun or the rest of the cosmos. See "Is There a Deficit of Solar Neutrinos?" [2nd NO-VE Workshop on Neutrino Oscillations, Venice, Italy, 3-5 Dec. 2003].


http://arxiv.org/pdf/astro-ph/0410460


In galactic collisions, gravitational collapse may produce high-density regions that collapse into massive cosmic objects - with high activity powered by repulsive interactions between neutrons. See "On the Cosmic Nuclear Cycle and the Similarity of Nuclei and Stars" [Journal of Fusion Energy 25 (2006) pp. 107-114].


http://arxiv.org/pdf/nucl-th/0511051


Galactic collisions may produce the quasars, gamma ray bursters, and active galactic centers that had been attributed to black holes before repulsive interactions between neutrons were recognized.

With kind regards,
om