Three (3) witnesses were standing outside the townhouse and talking when they saw this object very rapidly descended vertically down to the height of tree tops, hovered for a second, and rapidly disappearing back up. Approximately after one minute it happened again in same sequence. No pictures or videos were taken because everything happened so fast and no one was expecting it to happen. One witness described the color as "beautiful blue", "insanely beautiful", never seen color like that before. No sound was present, just some "wind like", swoosh. The object was round blue glowing disc shaped. Diameter about 12-15 ft. All its surface was glowing bright blue color, neon like, no windows or other lights were noticed. Everything happened very fast, maybe in 3 seconds from the moment it appeared until disappearance, and then once again in approximately 1 minute. It happened on March 16th, 2016 in Pikesville, MD, at approximately 9:50PM, it was dark outside.