I went outside to pick up dogs toys at around 11pm, I looked up and saw stars in a triangular formation. I instantly thought something was off as I’m fairly familiar with the night sky around here and thought they looked out of place. I had to squint as to me they looked like they were all moving very slowly. I got a point of reference from the moon and found that they were all moving in perfect form keeping the triangle shape but so slow. The front light was blinking and each time getting a little dimmer as it did. I looked into our living room to alert my partner to come and look and when I looked back only the two behind were left. I looked away again to get her to come see and again when I looked back they had both vanished.