I didn't want to hijack Eugenia's thread, so I started this one.
We lived for a year and a half in Central America. Every once in awhile there were floating spheres in photographs for no apparent reason.
I've enclosed a couple copies of the same photo. We were following some quadamundi in the jungle at night. (Quadamuni are smart little animals about half way between monkeys and raccoons. They have hands.) when I took several pictures. Only one had the floating sphere in it.
You might think lens flare, but there were no other lights for miles other than starlight and the camera flash and the coloring on the sphere is irregular. The local indians think they are spirits.
Swamp gas? UFO? Who knows. The second picture I changed the contrast ratio and lightened it so you could see the details.