I was looking for satellites on the night i question near luss, loch lomond and was also admiring the constellations in the nights sky. i thought i was looking at stars when one started to move slowly in a circular trajectory which was then followed by one "star" then another and so on. in total there were about 6 to 10 of these objects which circled one another at an extremely high altitude in the direction of faslane naval base. there was no noise from the objects. i took my eyes away from them in order to rub them and to make sure i wasn't seeing things. when i looked back they were still there. this lasted for about 30 minutes before they seemed to disappear. the really strange thing and what frightened me the most was that after the objects disappeared and whilst sitting in my car, something hit the rear of my vehicle causing it to move slightly. i got of my mark quickly, returning home.