evaporate

Comets threaten to arrange in the Solar system chaos

If the Sun will increase its luminosity by a few percent, the ice will begin to evaporate and jets of gas will give the comets the reactive acceleration.

“Graveyard of comets”, are found in the asteroid belt between the orbits of Mars and Jupiter, can make a real chaos in the Solar system when the Sun will Shine a little brighter. Astronomers can’t predict which direction will fly the heavenly bodies, when their trajectories change .

“We found a graveyard of comets. Imagine all these asteroids within the belt orbit the Sun for millions of years and show no signs of activity. We found that the majority of them are “dormant” comets that may yet come back to life if their solar “energopac” will be increased by couple of percent,” says Ignazio Ferrini of the University of Medellin (Colombia).

Previously it was thought that most comets in the Solar system is in the so-called Kuiper belt beyond the orbit of Neptune. However, it was discovered that several hundred dormant in the asteroid belt, moving in relatively stable orbits between Mars and Jupiter. Since they don’t show their tails and not move on watanasiritham, the scientists called their gathering the “graveyard of comets”. Continue reading

Short and long-period comets

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:

1. Short-period

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

Meteoroids

Meteors

It has long been observed that the nuclei of periodic comets are depleted, with every turn they glow weaker. Not once was there a division of cometary nuclei into two parts or more. This destruction produced or solar tides, or collisions with a meteor shower. The comet, discovered by the Czech scientists Bilim (Biloy) in 1772 was observed with repeated returns with the seven-year period. In 1846 its core collapsed, and it turned into two weak comets, which after 1852 was not observed. When in 1872, according to the calculations, the missing comet should pass near the Earth, there was rain of “falling stars”. Since November 27 this phenomenon is repeated every year, though less effectively. Small solid particles of the disintegrated nucleus of a former comet Bilogo stretched along its orbit, and when the Earth crosses the stream, they fly in the atmosphere and evaporate. A number of other meteor showers.

Meteoroids — the remains of comets, visible only at the time of evaporation are called meteors. The width of meteor showers is much greater than the size of the generated nuclei.

Photographing the path of the same meteor in the starry sky, as he is projected to observers, separated from each other by 20-30 km, determine the altitude at which the meteor appeared. Most meteoroids begin to glow at heights of 100 to 120 km and has already completely evaporated at a height of 80 km . Continue reading

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