Shining balls in triangle formationI was lying in my bed which is at the attic of the building and looking at the stars through the window on my roof. Suddenly, I saw 4-5 shining balls in the triangle formation, moving from the left to the right side of the sky. I've immediately woke up my wife, who also saw it for a few seconds until the objects suddenly made a turn and disappeared in the sky. There were no clouds at the moment and the objects were moving fast but I'm not sure at what distance they were, approximately about the usual height of the clouds. They've made no sound and I hear airplanes often so I know that it couldn't be any kind of airplane nor meteor, drone etc.The lights were brighter than the stars and and it seemed that the objects were symmetrically moving one from and to another.I've never seen anything like this before and I've always been a skeptic regarding UFO's.