Triangle shape craft 100 ft away from my house hovering

I couldn’t sleep went outside on my deck to smoke a cigarette I live in downtown Gloucester but at 1:30 AM in that part of town it’s very quiet no one outside no traffic etc so I was standing on my deck and I looked to my left and my back yard over looks another street and this is where I saw the craft less than 100 ft away from my yard it was about the size of a dog house it was hovering it made no sound had red and green lights on the front it would move forward , stop and hover and the lights changed from red to green then it move forward and stop and hover and lights changed from red back to green all this time it made not a sound this went on for about 15 minutes then it just disappeared completely. I should have gone in the house to grab my phone to film it but I couldn’t move I just couldn’t believe what I was seeing . That same day that I saw the craft in the Gloucester news the city found huge Boulder rocks that was on the beach at one of the local downtown beaches they have no idea how the rocks got there no drag marks on the sand at all very strange!