I witnessed a ufo in the sky behind my house on march 4 between 9:00 pm and 9:10 pm. it hovered for a while and slowly moved up and down. while i watched it i noticed that it pulsated between a bright white light and between a combination of red and blue light on the top portion of the circular object. the bottom portion was all white light but i could see like a slight spray of contrails on both sides of the bottom of it. it was silent and just slowly moved around in the sky. my 17 year old son came out to see it and also observed it. i also noticed that an airplane was also in the area at the same time and there was a definite difference between the two objects. it wasn't like anything i've ever seen before. it wasn't a helicopter and it wasn't an airplane. i took one photo and a short video. anyone that views it can be the judge of whatever they think it is but i know what it isn't.