Went outside to get some fresh air just after 10 pm yesterday (May 5th). First thing I've noticed was a "shooting start", I thougth that was pretty cool, first one this year :).Then I have noticed two airplanes far in the distance (me facing West).Then I look up to admire the clear and beautiful night sky, full of stars. All of a sudden, I notice a series of dimmed lights flying in formation. The formation was similar to a shevron, I could also notice a fairly distinct boudary (or the edge) of the object the lights where part of. The object resembled a flying wing like Northrop YB-49 but it almost looked transparent.It flew in a straight line from South to North, at about 80deg up from where I was standing. It was completely silent!I couldn't tell how high (altitude) it was from the ground but in relation to the tree that it flew by, the wingspan was about 1.5 to 2 meters (the tree is about 12 meters tall). The object disappeared behind the tree.