We were awakened by this loud sound around our home and saw in the sky through some trees this large flying object hovering over our area. We have never heard or seen anything like this and we knew it could not have been a helicopter or an airplane. It was slowly moving, sometimes sitting stationary in one position for long periods of time in the sky. After slowly circling an area, it would move to another and we saw 2 white beams of light emitting from the object. The object suddenly left quickly after it was finished with whatever it was doing. We felt the object must have been positioned over the vicinity of New Carollton subway station or circling the area in search of a landing area. We were deeply disturbed by this sighting and would like more information as to what it was doing.A large flying object of many lights and loud humming sound