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National UFO Reporting Center
Sighting Report
Occurred : 12/9/2017 19:30 (Entered as : 120917 19:30)
Reported: 12/9/2017 9:45:15 PM 21:45
Posted: 12/10/2017
Location: Arvada, CO
Shape: Formation
Duration:20 minutes
I was standing outside facing west from approximately 64th and Llamar. I like to star gaze.

Out of seemingly nowhere a long line of blinking red and green lights just appeared in the sky, no big flash or start, it was very subtle. they were definitly lights though. I thought they might be crane lights but there were thousands of them in a straight line that seemed to stretch for miles.

Maybe they were lights on an airplane, but they moved across the sky so slowly that you'd think they weren't even moving but over the course of a hour they slowly drifted westward. A plane would've flown much faster across the sky at that distance relative to myself. Best estimate of distance is at the start being maybe a half mile to a mile above me and a few miles to the south west.

There didn't seem to be any other lights.

It didn't do anything but rapidly blink between red and green and slowly drift west.