This video was done by Gavin Heffernan and it's a time lapse of Death Valley's dunes. It's a work of art. Stars, geminid meteors, star trails. Then...a UFO. Heffernan says:
The "UFO" appears at (1:30-1:35) and makes three broad circular sweeps over the desert. Though in timelapse it appears to be moving fast, consider the 5 seconds = about 50 minutes, so it's creeping. Closer picture below. It can also be seen cutting through the circular star trails in the shot used above!
Just take a look at the video. It's not going to be easy to explain.