Whereas some data observed in the center of our galaxy is explainable by proposing the existence of a supermassive black hole (which we all know as Sagittarius A*), there are some observable facts which are not explained by this hypothesis. Now a very recent paper proposes something completely different for the center of our Milkyway:
This is in the early stages of peer review, but nonetheless a very interesting theory.
This is in the early stages of peer review, but nonetheless a very interesting theory.