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Stars are the main population of galaxies. The star is red-hot balls, like the Sun. However, the world of these celestial bodies is unusually diverse. There are stars, giants and supergiants. For example, the diameter of the star alpha in the constellation of Hercules 200 thousand times greater than the diameter of the Sun. The light of this star goes the distance to Land over 1200 years (and the speed of light is 300 thousand kilometers per second). If you could fly on the plane of the equator giant, then it would require 80 thousand years.

There are also star-dwarfs, which are much inferior in size to the Sun and even the Earth. The substance of such stars is notable for its unusual density. Thus, one liter of the substance of the "white dwarf" Kuiper weighs about 36 thousand tons. Match made from such substances would weigh about 6 tons.

A greater density of neutron stars have. The average density of matter reaching 100 million tons per one cubic centimeter. Such stars are composed mainly of nuclear particles - neutrons and essentially represent a huge atomic nucleus.

Stars differ in surface temperatures from a few thousand to tens of thousands of degrees. Stars red are considered "cold". Their temperature is only about 3-4 thousand degrees. The Sun was high, with yellow-green color, the surface temperature reaches 6 thousand degrees. White and blue stars are the hottest, their temperature exceeds 10-12 thousand degrees.

Many stars have similar hot satellites. In the Universe there are double, triple and more complex stellar system. These star families have with each other the forces of mutual attraction and revolve about their common center of mass.

The stars in the Galaxy are moving at a very complex trajectories. With great speed (about 250 kilometers per second) rushes in world space and the Solar system. She makes a complete revolution around the galactic centre for 180 million years.


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2014-03-21 20:04:00
Boma smoothie
2013-10-22 19:36:40
I agree need more information
2013-10-20 13:07:23
PCA understood))
lady DIANA
2012-10-30 08:16:29
very good, helped me with homework!
2012-10-16 10:30:45
It's me!
2012-02-02 08:49:46
2011-12-28 03:24:36
Modern science reveals great diversity in the world of stars. There are stars in volume in thousands and millions of times greater than the Sun, but very sparse: the density of matter in them thousands of times less than the density of the earth's air. There are stars less land, but the ingredient in them is very dense: tens of thousands of times greater than the density of gold or platinum.

Until recently, the greatest of famous stars was Epsilon in the constellation of Auriga. Its diameter (or the diameter of one of its "components", as the Epsilon Area - double star) 300 times the diameter of the Sun. If this star "to put" in place of the Sun, not only Earth, but also more distant planets (up to Uranium inclusive) will fit inside it.

However, this monstrous star turns out to be insignificant dwarf compared to the other star, the dimensions of which have been identified only recently with a huge telescope with a 5-metre mirror Observatory mount Palomar (USA). This is the star alpha in the constellation of Hercules.

The diameter of this star 200 000 times larger than the diameter of the Sun, and hence its volume 8 quadrillion times (a quadrillion is a number with 15 zeros in a million billion) exceeds the volume of the Sun. A beam of light propagating with a speed of 300 kilometers per second, and reaching from the sun to the Earth for 8.5 minutes, and to Pluto (the furthest planet in the solar system) for 5.5 hours, will be a distance equal to the diameter of alpha Hercules, only 12 days. If you could travel along the equator of the star on a jet plane, then it would require 80 000 years.

Still not all clear about the nature of this monstrous stars. But the structure of it is difficult, it's not even double, and "Quad" system, surrounded by a cloud of cold gas.

How far away is the star? The distance from the Earth the light passes over 1200 years. When the ray of light of this star, now reflected in the mirror of the earth's telescope, left star on Earth was the early middle ages. In earthly measures this distance exceeds 11 quadrillion kilometers, and jet overcame him for 1 200 000 000 years.

But there is no reason to assume that alpha Hercules - the greatest star even in our star system. This is only one of the greatest measured on stars today.

Y. Perel, scientific Secretary of the Commission for the history of astronomy astronomical Council of the Academy of Sciences USSR.

2011-12-28 02:13:35
the largest diameter of the star is about 2100 diameters of the Sun (Canis Major), but not 200 thousand, it is necessary to check!!
I Polinka!!!!!
2011-12-06 12:36:38
che fine,if only more information

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