I was sitting out in the back yard and my friend noticed something in the sky. he pointed it out as a ufo and i laughed at him at first.So i then decided to watch it with him for five to ten minutes. it would get brighter and then dim. it also started to get bigger and changed shape. it seemed to move around a little as it was hovering. then i went in the house to get my camera and took some pictures of it as it changed shape and continued to dim and brighten. i have never seen anything in that area of the sky before. it was out west of my house which is not far from the everglades in florida. a plane flew bye as this was happening and if definitely was not a helicopter. there was no sound and it just disappeared after 20 mins.