Comets are one of the most studied astronomical phenomena because of their spectacular nature. In the chronicles of past centuries, they are described as unpredictable stars that have the appearance of a star surrounded by a faint fog or hair and followed by a more or less long tail.
Comets are bodies that revolve around the Sun in a similar way to planets, but in very elongated elliptical orbits.
As for its dimensions and structure, only from 1950 to today it has been possible to specify the physics and chemistry of comets: these are ice conglomerates with diameters of a few kilometers that, in proximity to the Sun, because of the heat absorbed , they release large amounts of gas in space, with which the spectacular visible attributes of the comet are formed: the hair and the tail.
The possibility is considered that comets are the first conglomerates of gases and dusts that condensed, five billion years ago, on the edges of the primordial nebula that gave rise to the Sun and planets, that is, they are among the objects oldest of our Solar System.
Comet West 1976 was the brightest comet in recent years and it seems that it reached, although for a very short time, a magnitude of -3.5 around its perihelion point. However, at that time the comet West was too close to the sun to be seen with the naked eye, and could only be seen with a telescope.
Comet West's photo shows two different tails. The thin blue plasma tail is composed of gases and the white broad tail is composed of microscopic dust particles.
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