White solid light making a very loud thumping soundHeard a loud thunping sound as it was almost loud enough to break the sound barrier, i looked up in the sky and at a low altitude i saw a white solid light traveling at a slow speed heading south towards Mt.Graham, it was not blinking it was solid. It was a loud thumping sound that was loud enough to get dogs barking all over the Glenn Meadows area. I watched it for a few minutes until before my eyes it dissapeared, the sound and the light was gone. I was in the Marines for several years and my job was bulk fuel which consisted of fueling military aircraft like helicopters and f-15 and 16's, i know this was not a aircraft of ours. Very weird.