UFO. United States

This version can refer to any observation in the contrast of an object on a solid background, both day and night.

Night it can be a light in a dark house, on the technique in a dark room, etc.

Day the color of the sky sometimes merge with the color of the surface of the Earth at the horizon level. While it may seem that the object on this piece, floating in the sky. It is clearly seen, for example, at the marine landscapes. This illusion may occur as in the photos (especially black and white) and by direct observation.

The brightest heavenly bodies in the sky are Venus, Jupiter, and sometimes Mars and, of course, the Moon.

Venus is the bright yellow of the evening or morning star, shining in the sky on the background of evening or dawn. Maximum brightness of Venus can reach up to 4.3 m, and she is the third brightness of the sun in earth's sky after the sun and the moon. It so well reflects the light of the Sun that it is relatively easy to see and day, especially if you know the location. It manifests itself in the form of tiny blinking white dots.

For UFOs often take stages of rockets, parts of space ships burning in the atmosphere, the launches of various missile technology for military purposes, etc., and traces from them. They attract attention mostly in the dark, but in the day time have a greater aura of mystery.

Formation of the track of the launch vehicle occurs in the tropopause (the layer between the troposphere and stratosphere), which sharply reduced the vertical temperature gradient. The emergence of the so-called "jellyfish" influenced by water vapor, which are subject to enhanced condensation.