Hi, I am new to SciForums and have a question in regards to the behaviour of ufo's. At night I look up at the night sky and see objects that differentiate in intensity of brightness. Some go from a bright white star coloured object to a flourescent light blue. The most common object I have seen differentiates from a bright white star colour to a red than back to white. I know these objects aren't stars as they tend to zig-zag from side to side and up and down. Has anyone got any ideas to what these objects are.