Gravity is just a theory, aka not real.

The moon is getting farther away from earth, too

it's not, it goes in, it goes out... in is called a "super moon" with regard to the moon around our planet

perhaps you should go back to the 19th century of physics and learn how gravity actually works and how objects floating in space can get stuck looping around each other?

there is this old problem too, part of this, that some recent theatrical shit probably abused (idk, never seen it, not really interested because it's drama) called the Three Body Problem and it is one of the early types of dynamic systems (now often called chaos theory), where if you have 3 objects, their relative motion is ever changing

well, think about it then, 3 bodies becomes unpredictable, what about 2 to the power of 50 objects all moving around each other... that probably is about a round estimate of what our galaxy is

"circle" and "line" and "round" and "flat" are extremely artificial notions compared to the lumpy, bumpy reality