What is stars?
Recently I was the participant of dispute, surprising for me. It was talked of stars and their place in the Universe. My opponent tried to prove that the Sun cannot be a star. And the main argument of the unreasonable debater consisted that “ too they are different. Look on stars - same at blue points in the sky, and the Sun big and orange “. And still the adult with the higher education.
By the way to prove, to the person that he is mistaken to me it was possible far not at once. Though, apparently, now even first graders know that the Sun is a star, and not the biggest and not the hottest. Just to Earth in scales of the Universe settles down very close therefore its light for us the brightest and important.
“ But the Moon to shine too at night why then those points in the sky cannot be the same moon, for example? “ gave one more “ convincing argument “ debater. Yes, the Moon it is valid to shine, but not in itself, and only reflecting light of a star by the name of the Sun. Planets near other stars, shine too, but their light is so insignificant that from Earth it is simply not visible. It is eclipsed by light a number of the located stars.
However, concept nearby of a space, for the person rather conditionally. As well as concept time. If to consider a time span not as human life and as life of the Universe, then stars are born too and die. They from gas and star dust which concentrate in uniform weight, a cloud are born. This cloud is called a fog.
When the fog begins to rotate, its temperature increases. Temperature of a fog can reach the highest temperatures, but on reaching temperature about one million degrees, there is an ignition. Having lit up, the fog becomes a star.
Our Sun is yellow - orange color, but not all stars same. Is, for example, blue and white - the young and hot (directly, as at people). Is yellow and orange - as well as the Sun is stars of middle age and temperature. And, at last, there are stars of red color (sometime and the Sun it will become). Red - the oldest and “ cold “. Further the star begins to cool down also quicker and quicker in, the end of the ends, dies away.
Once long ago the person lifted up eyes from the earth on the sky and saw in it stars. Ever since he tries to study it. And to distinguish one stars from others to the astronomer began to group them among themselves, connecting the imagined lines. Named these groups habitual objects: lion, snake, scales etc. So there were constellations. The most known of them seen in the Northern hemisphere - Pegasus, Cassiopeia and, of course, Big and Small Medveditsa.
Even if some of well-known stars will go out right now, we do not learn it any more. There can be our far descendants, very far descendants. Too it is far from us there are these stars. Even light from them goes to us for many years. And it gathers the speed of 300 000 kilometers per second. And how many it passes in one year? Even it is terrible to think what us divide distance.
It is better not to think of the sizes of the galaxy at all. It is formed by billions of stars which rotate around the general center. Meanwhile galaxies in the Universe great variety, scientists consider that the account goes on billions. We live in a galaxy under the name the Milky Way. In the sky our galaxy looks as the shining strip white, is more right than dairy color.
For example, ancient Romans considered that this miracle was formed at will of gods. The legend says that when the goddess of the sky Juno nursed Hercules, several drops fell and, having turned into stars, formed the Milky Way.
The mankind cannot investigate the galaxy yet, but knows that the closest to us another is at distance more than two million light years. The neigbour - Andromeda is called, it is more right we so called her. Sometimes there is a wish to dream up on a subject - whether there is life in the Universe. And when you will imagine its sizes and you will present what insignificant part in it is occupied by mankind, you think that we are for certain not one.