I was taking the trash out to the car so i could drive it down to the dumpster. this was a few minutes after 10. as i was approaching the car i caught a glimpse of something and looked up straight ahead and that's when i saw it. it was only a few hundred feet above tree top level just sitting there. it was a black(as far as i could tell at night could've been a dark grey) square shaped object with four greenish blue lights on the bottom. i would guess that it was at least 50 yards across. my adrenaline had kicked in at this point. i knew the object wasn't anything that was public knowledge. then my second thought was that it wasn't even from this planet. it was silently hovering not making a movement and then there was this high pitched humming sound that i've never heard before and it was gone like something out of star trek. i completely lost my shit i was both scared and excited. the whole ordeal lasted about 30-40 seconds i managed to get one picture.