My sister and I were on a trampoline looking at stars and satellites. I noticed a object overhead moving in a strait line going north. It was dim for a few moments, then flashed a very bright white, then went dim again. It repeated this over and over about every five seconds, each flash getting brighter. It did this seven or eight times. The last few flashes were extremely bright, enough to hurt my eyes. Like a flash from a camera. Then it slowly grew dimmer until we lost sight of it. It was definitely not a plane or satellite.