UFO. United States

Halo usually appears around the Sun or moon, sometimes around other powerful light sources such as street lights. There are many types of halos, but they are mostly caused by ice crystals in Cirrus clouds at a height of 5-10 km in the upper troposphere. The form of the observed halo depends on the shape and arrangement of crystals. Reflected and refracted by the ice crystals, the light often turns into a spectrum, which makes halo look like a rainbow, but a halo in low light has a low chroma, which is associated with the peculiarities of twilight vision.

A continuous spark, which is usually described as a "blue flame" on the tops of ship masts, airplane wings, flagpoles, spires, street lights, trees and other tall pointed objects, where a smaller surface area requires less voltage to attract oppositely charged particles to each other. Sometimes it looks like small lightning bolts on the surface.

Photo editing began to be used almost immediately after the advent of photography techniques. They were divided into methods of photomontage without manipulation of the image after receiving the photo and retouching of the photo itself or its negative (plate, film, etc.)

A rare natural phenomenon, a unified physical theory of the origin and course of which has not been presented to date.

There are about 200 theories explaining the phenomenon, but none of them has received absolute recognition in the academic environment. Since this phenomenon was introduced into the scientific sphere by the English physician and researcher of electrical engineering William Snow Harris in 1843, and a scientist of the French Academy Francois Arago in 1855, many hypotheses were put forward. Here are selectively some of them: