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National UFO Reporting Center Sighting Report
Occurred : 7/31/2008 22:30 (Entered as : 07/31/-08 22:30)
Reported: 8/1/2008 9:26:39 AM 09:26
Posted: 8/12/2008
Location: Denver, CO
Shape: Light
Duration: 5 seconds
Very fast disappearing light in nighttime sky

Was laying on my back watching for satellites (they look like little stars that move across the sky in a systematic way). Thought we saw one but this was going at least 5 times faster (same size, same systematic way) and I thought maybe it was just a really, really fast satellite - it crossed half the sky in less than 3 seconds, but then it just disappeared out of the sky in front of my eyes. Not over the horizon or behind clouds, but poof and gone. Have seen may satellites, but nothing like this. Definitely not an airplane - there were several of them in the sky at the same time and it was very easy to ascertain their altitude and speed/shape.