I was thinking that the sun must orbit something within our spiral arm in the Milky Way, or be affected by other astronomical bodies - surely not just the supermassive black hole centre.
I have looked at some information and they say that the sun has a sine wave-like movement as it orbits the galactic centre. But what is causing this movement? And what sort of size or density would an object need to be to tug on our solar system uniformly? As I imagine the galaxy is like a soup, with everything churning around itself - still with a common centre (Galactic Centre.)
I'm looking at it in this way: There are black holes between us and the one at the centre which I would assume have enough gravitational energy to affect our star - if not have our star orbit one of them. Is that correct?