my theories on orbs that get bright and then fade away are that they are asteroids with frozen water on the surface and the sun reflects light off of the ice and we see that. Then the light fades away as the asteroid keeps on going out into space.

But sometimes when I see those big flashes that slowly fade, I watch the light leave into space but not in a straight line but actually stop and change direction way deep out into space.

But for me, why I know that ufo's are real is one July night 2 summers ago there was an anomoly that happened late at night when all the stars were luminated. There was 2 crafts in front and one behind, they formed a unit, a triangular unit and they went across the sky from south to north but they were sooo far away from earth. Soooo far out past where satelites can go. There was 3 and they were so far away and yet moving so fast that it only took about 15 seconds for them to clear my view of deep space. But how I kne I was seeing what I was seeing as because the one in the back couldnt keep a perfect symmetrical triangle with the rest of the fleet. The one behind was moving to the left, to the right, going too fast and going too slow, it couldnt keep a perfect speed behind the front two, the front two were uniform, down to a T. But the back one proved that it was a being, a being that was a bad driver...bad compared to the two leaders of the fleet.