Boomerang shaped craft, adorned with, or emitting, white lights.At approximately 20:00 on October 30, 2016, I was taking my dogs out in my yard for a bathroom break. It was a crisp, clear, starry night and as I am a nightly sky watcher, I turned my eyes upwards.I play little games with myself while I sky gaze such as finding and greeting constellations, planets and stars that I know and finding clusters of stars which may appear very faint (I live inside the city so there is light pollution) with my naked eye. It was this exact thing that drew my attention to what I saw next.As I was scanning the skies and engaging in my usual entertainment, I noticed above me a very faint, small cluster of what I thought at first were stars, but as I continued to look at them, I was confused to see them moving slowly in a straight line approximately North to South above me. My thought in that moment was, "Why are those stars moving?" and I actually did a kind of double-take because I thought my eyes were mistaking the movement. They were not. The object appeared like a very far away, faint, moving cluster of tiny white stars (no idea how many but a fair amount) and the only reason I could discern it's shape was not from any outline against the sky, but from the shape of this "star cluster" itself.It moved slowly (a little slower than an average plane) and was soundless. I cannot even begin to estimate either its distance or size but I had the very real impression it was both VERY LARGE and VERY FAR AWAY. The size dwarfed that of any planes that I see over my yard. There was also no discernable sound I could associate with it and it appeared silent to my ears.I watched it move Southward until my line of sight became obscured by the trees at my back fence, but I was able to keep my eyes on it for what seemed like quite awhile (mere seconds, but I was pretty focused on it and it seemed much longer). My dogs noticed nothing.Then I ran into the house super excited to tell my husband what I had seen and make a social media post about my excitement! I have seen many unexplained objects in the skies over the years that could not be explained away or mistaken for anything identifiable, but this was far different even than any of those!