I was sitting out at a bonfire, 8/31/12 at approx. 9:30 pm star watching and watching planes go over. Noticed a blue steady light travel from west to east until it eventually disappeared. The "light" seemed to hover at times then would steadily take off again. No sound, however every plane that flies over our home ALWAYS makes noise. This was no plane, end of story.Next incident,... At approx. 11:31pm 9/3/12, while lying in bed, once again, that all too familiar humming sound directly above my house. My mother has heard it now, as well as my daughter. It has a roaring sound that mimics a large engine running or train that whains (if that's even a word. To be quite honest, I'm over seeing and hearing these UFO's. I decided to proceed with reporting these so that others that may have seen, will know they're not crazy.