I was in my girlfriends back yard and a restaurant owner friend was visiting. We noticed a large sphere above us. Its surface was opaque and shimmering, at about 10,000 feet, as high as the Sandia mountains. It hovered and oscillated there about fifteen seconds. Then it shot northeast toward Placitas, turned on a dime, at about 60 degrees, and disappeared over the mountains in about two seconds. 12 miles in two seconds! Speed estimated at over 20,000 m.p.h.