Huge Silent Chevron with all white lights surrounded by gas flying slow and low about 100 feet off ground for 15 minutes.

Flying NW from Cape Canaveral/Kennedy. Boomerang/chevron shaped. Surrounded by a gas like fog. Totally silent. As it approached directly over us it slowed to about 10-15 miles per hour. It got very low, barely above treetops and rooftops. Did not cause any breeze or wind when overhead. So huge it covered almost the entire block. Color appeared dark gray or black yet seemed partially opaque/translucent/transparent combined. It blocked out part of the night sky yet in spots you could see the stars through it. Difficult to look straight up as it went directly overhead as lights were a blinding constant white. It looked like one solid object at times yet also like 7 to 12 individual objects somehow connected. It continued on past us in the same direction at the same speed. It did not accelerate speed but it did go a little higher.