I saw a bright light higher than I have ever seen before. It was brighter than the stars but seemed to be the same size as a star. It would fly north, than as if it moved in reverse south. It disappeared a few times as it shot back north then disappeared. Suddenly at the same time the sky to the north lit up as if there was lightning only the flash was green. What I found to be weird is that it disappeared and a flash happened simultaneously from the north part of the sky It was silent with no tail behind it. As well as the flash no sound at all.