Not too worry, Sam
Sam,
If there truly were an object of that size in the vicinity of the sun, you would radily be able to observe with the naked eye (please don't try staring at the sun, tho). More importantly, we would no longer exist.
Sam, you are reacting to an optical illusion and you are allowing your eye to "see" something that isn't there. The "arc" that you think is the "rim" of some large round object is merely a arc of light.
You have an obvious interest in astronomy. Unfortunately your sources of information and wild imagination isn't helping convert that interest into knowledge.
A mind is a terrible thing to waste.