I was watching TV and had just stood up to turn it off, when I heard a sudden sound like a boom with a light flash.I then looked out the window to see silent translucent dark, orb blue green light-emitting object with DARK center making arc towards mountains in distance over which it apparently descended and disappeared.I thought it was a green fireball, as I had seen one 2 years ago in very similar conditions, at the same time of night.The object that I saw was was not as luminous as the other one I had seen 2 and 1/2 years ago.That object was a BRIGHT green, while this was more towards a DULL TRANSLUCENT BLUE-GREEN with what seemed to be a DARK CENTER. The dark center really fascinated me and made me realize that this was NOT a meteor.I was quite shocked, as I see meteors frequently here at HIGH altitude, but this was at very low altitude, 1-2000 feet at most and it was almost gliding as if an airplane coming in for a landing... but of course... it was anything but.Then it was gone. That simple. I was shocked and yelled out, and my wife woke up.