At 8:50 in evening, two of us were outside observing the night sky. with some patchy high clouds to the west, i noticed what i thought was a satellite emerge from behind the clouds traveling from wsw to the se. almost immediately behind it came a second, then third and fourth light moving at the same speed and in line with the first. i directed my friend to the area of the sky, and he saw them. as we remarked how odd, more lights continued to emerge following the same path and speed. i ran inside and got my wife out to confirm what we were witnessing. she continued watching as did my friend and me. after 20 or more objects were observed, i got my daughters outside to see the tail end of the line of objects as they trailed off and disappeared in the southeast sky in the direction of philadelphia. the entire sighting lasted 5-6 minutes from first sighting to the last object disappeared from view.