far boundless, deep blue sky and unattainable, it has always beckoned people to him.No wonder people tried to fly up to the clouds like a bird.No wonder it was here that he settled his gods and guardian angels.
But the sky has not always been supportive of the inhabitants of the earth.Quite often it happens that the test fell on the people, as if from a cornucopia.And then they tried to find an explanation or at least a precursor.They attributed the sudden storms and hurricanes, eclipses of the sun and moon, bizarre figures in the clouds.One of the fatalities was considered messengers of the comet.Quite a long time, people believed that when a comet flying to the ground - it's not good.
So what is a comet actually?The very name of this phenomenon comes from the Greek word which means "tail" or "shaggy tailed."Today the comet is called the celestial body beyond which stretches trail of shiny particles.With the naked eye you can see it is quite rare, once in ten years -pyatnadtsat.For example, in 1997, he flew to the Earth, Comet Hale Bopp, the bright lights of which could see everyone on the planet.
caudate light slowly floating on the starry sky.When people do not know exactly what the comet is trying to solve its riddle, to explain themselves its value.But clearly it feared then and now - in the twenty-first century.In 1527 the space visitor brought upon earthlings such horror that many are sick or have died from fear!But by the end of the sixteenth century, astronomers discovered that comets have their own orbits obey the laws of physics.Isaac Newton in 1610 calculated the path of such a body, and found that it has the shape of an infinitely extended curve.Edmond Halley studied regularly flies a comet to Earth and came to the conclusion that we have not visited many lights, but only a few of them several times.Their orbits are stopped at a certain frequency with the route of our planet.In support of his theory, he predicted the next appearance of the comet named after him - Halley on 1758.The last time she was seen in 1986.
When a man has learned to use a telescope that is a comet - learn.And over time, we have received high-quality images of deep space.Today, scientists know about the 1200 comets.Twenty-five percent of them several times back to the sun.
Comet consists of several parts.This, first of all, the head, which has a core and a shell, and a tail, which extends over a long distance.Through a translucent bright stars.Head form solid particles (frozen gases and ice).The size of such a body could be a few kilometers, and the length of its tail - the millions of kilometers.When the light is close to the Sun, the ice begins to melt and evaporate.Several of these communities, spread over millions of light years, and the comet completely dissolve in space.
Now you know what a comet in fact, and can not be afraid of its appearance in the night sky.And even on the contrary, look forward to its arrival, and enjoy a breathtaking appearance.
