I flew into denver international airport on monday and took several random pictures through my airplane window seat. the sky appeared clear to the naked eye so i was unaware of the unusual concentric rings nor did i see the shar of bright white light above the tail wing of a parked aircraft during taxi on the runway. when i got to my hotel later that day, i started leafing through my pictures and picked up on these strange circular cloud formations. as i stared at the picture, i noticed the shar of light below the concentric cloud rings. my feeling is that this is a shockwave of energy seen only through my cell phone camera similar to when a space shuttle re-enters earth's atmosphere and breaks through the sound barrier. it seems like an unitdenfied flying object remained invisible as it either took off or re-entered near the denver airport. the other picture shows dark concentric rings and gray distortions in the sky that look like smudges of light smoke. the distortions seem to lead back toward the mountains in the distance. the two pictures were taken within one minute of each other. note: if you compress the second photo, the dark concentric rings and gray smudges seen below are easier to see. if someone were to follow the exact taxi of my aircraft that day, the airport and/or satilite imagery might reveal more footage to corroborate this unusual camera incident. there should be ample airport security cameras that should have captured both ground/air traffic as well as weather conditions on that day. good luck!