Last night my wife and i took a hot tub in our back yard at around 22:30 pm . we live se of denver international airport about 8-10 miles . we both work for the same airline , i'm into my 19th year as an airline employee " ground ops 's supervisor and my wife is a flight attendant . we were sitting in our hot tub i was sitting facing south my wife was across from me facing north . she said look at them lights and was pointing behind me i turned around and looked up . i saw two dim llite lights moving at a very high rate of speed one directly behind the other but at a long distance apart " if i were to hold a ruler over my head they would have been 3" apart . i grew up on air force bases till i was 13 , i live in a very busy air space area 24/7 air traffic . i love astronome and have a telescope since i was a young child . what we saw last night was not of this world . if their is anything elsa i can tell you feel free to contact me . oh p.S they were not satellites !