Saw 3 lights in a triangle fade into view. 1 red light & 2 white lights. Not a plane, lights never came back after fading back out.

Looked up and saw a triangle of lights fade into view, like a plane's lights would between blinking. Red light in front, two white lights behind. I watched it for a second and then the lights fade back out. They never fade back on and I then saw a large rounding shape barely silhouetted against the dark night sky. Visually tracking the direction of the slow moving lights, I kept focused on where the lights should fade back in, but it never did. I watched for a couple minutes then came in to get my wife to see if she could see it, too. It never came back on, but the triangle is lights was definitely there but only the one time. Super weird.