“Our observation was aimed at studying the chemical composition of the comet Tempel 1,” says Michael Mumma (Michael Turner) from space flight Center NASA Goddard (NASA Goddard Space Flight Center). The Mumma and his colleagues used a powerful telescope, the Keck Observatory in Hawaii for a detailed analysis of the light emitted by the gas of the comet at the moment of impact. Since each type of atoms and molecules has its own characteristic frequency of radiation, on the basis of this, scientists were able to determine the chemical composition of the comet’s nucleus.
Comets are blocks, which consist of ice and dust that move in elongated orbits. It is believed that the nucleus of the comet is gas and dust formations, remaining after the formation of the main bodies of the solar system.
When approaching the Sun, its radiation heats the comet’s nucleus, releasing dust and gas. The latter form a coma (cloud around the nucleus) and one or more tails. Repeated heating leads to the fact that disappear from the surface of the substance having a low boiling point. In fact, the nucleus of a comet is formed “crust” that is different chemically from its internal regions. This makes it difficult to determine the true composition of the comet just by studying the gas in its tail. Continue reading
Comet often appears to us as a star with a huge tail of fire. But few people know that this tail, it becomes only, when approaching the Sun. Because it is a heavenly body, heating the ice particles that make up the comet makes the fire produced gas and dust.
As already mentioned, the comet is a large lump of rocks, mixed with snow. Jokingly astronomers call them “dirty snowballs” because of their similarity. Actually ice, which is part of any comet, it is nothing like the frozen gas. To solve the mystery of the origin of the Solar system, several spacecraft have been sent to these heavenly bodies, to collect samples of the substance from which they are composed. After all, many scientists believe that comets were formed from the matter early, even before the appearance of the Solar system.
Also there is a theory that the Sun is his second, invisible part of man that attracts comets. After they all gather together, their weight overcomes the force of attraction of the Sun and the movement continues. This, of course, all comets burn. Hence the phenomenon of a meteor shower. This theory may explain the total disappearance of all comets occurring once in 100 million years. Continue reading
The diversity of comets in the Solar system
The comet (from al-Greek. hairy, shaggy) – a small celestial body having a foggy view, orbiting the Sun in conic section with a very extended orbit. When approaching the Sun, the comet forms a coma and sometimes a tail of gas and dust.
Comets are placed into circulation periods:
At this time, found more than 400 short-period comets. Of these, about 200 were observed in more than one perihelion passage. Short-period comets (period less than 200 years) come from the region of the outer planets, moving in the forward direction for orbits lying close to the Ecliptic. Away from the Sun, comets usually do not have “tails”, but sometimes have a barely visible “to”, surrounding the core; together they are called the “head” of the comet. Approaching the Sun the head is increased and there is a tail. Many of them belong to so called family. For example, most of the short-period comets (full rotation around the Sun lasts 3-10 years) form the family of Jupiter. A little smaller of a family of Saturn, Uranus and Neptune (the latter, in particular, is the famous comet Halley). Continue reading