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Thanks all. Here is an example I tried in Gimp using "Lighten only" blending mode with two layers. Remark: BF is correct about the flaw of star trails in front due to gimp's (maybe PS too) blending mechanism, but sparky's point (aurora isn't cloud) could also be true. In my example, there are...

Thanks, Fred and Cindy. Know all about star_trail photographing. But the image shows both northern lights and star trail scenes. Here is another screenshot image taken at the same place: Yellowknife and Great Slave Lake, Canada. Only northern lights are the main scene and no star trails.

This is a screenshot from the National Geographic site. Just wonder how the image is photoed or processed?

Organ Pipe Cactus National Monument

London Bridge, Lake Havasu City, AZ

@Grand Canyon

Half Dome, Yosemite Half Dome - Vernal Fall - Nevada Fall

El Capita n, Yosemite (do you see the rock climber?)

Cathedral Spires, Yosemite

N.Y., N.Y. in L.V. (I think the Milky Way was caught in the image)

Luxor (Tropicana) in L.V.

Excalibur in L.V.