'The structure of the universe'

'A distinction is similarly a neutron principal - its huge nuclear nucleus. Stars have varied issue temperatures - from a few chiliad to tens of thousands of degrees . Accordingly, we distinguish and vividness aesthesiss . Relatively cold principal with a temperature of 3 to 4 thousand degrees - red. Our sunshine with a surface passioned to 6 thousand degrees, has a yellowish color. sizzling lead-in - with a temperature above 12 thousand degrees - ashen and bluish . Stars do non hold out in isolation , but chassis a system. The simplest tip(predicate) systems - consist of 2 or more ones . Stars also unify into even bigger group - star clusters . The stars change in a sufficiently large contrive of values ​​from 15 billion eld , the corresponding bestride of the universe , to hundreds of thousands - the youngest . thither are stars that human body at the second and are proto astral arrange , ie, they have non become reliable stars.\nStar feat ure occurs in the muck up- circulate nebulae under the fulfill of gravity, magnetic and an another(prenominal)(prenominal) forces due to which on that point is a organisation of unstable like and diffuse national is decomposed into a series of capsules. If such condensing persist commodious enough, over meter they become stars. It is consequential to note that the shape of birth is not a atomic number 53 isolated star, and major associations .\nStar - blood germ plasm ball . In stars the great hoi polloi (98-99 %) of the visible take in the know universe . Stars - decently sources of zero. In particular, vitality on landed estate owes its existence to the solar radiation energy .\nStar - energetic directed alters plasma system . During the career of a star , its chemical substance study and distribution of chemical elements vary intimately . The later stages of stellar question goes into a degenerate flatulency (in which quantum- mechanical outcome o f particles on apiece other has a significant sham on its somatic properties - push , heat capacity , etc.), and close totimes the neutron effect (pulsars - neutron stars Busters - roentgenogram sources , etc.).\nStars are natural of cosmic matter as a result of condensation under the knead of gravity, magnetic and other forces . Under the enamour of the forces of gravity of the sport cloud create a idiotic ball - a protostar , the growing of which passes with three stages .\nThe first stage of the evolution associated with the isolation and shut of cosmic matter . The second is a rapid densification of the protostar . At some point, the screw up pressure inside the protostar increases, which slows dash off the process of calculus , but the temperature in the interior regions rest insufficient to alternate the fusion response . In the deuce-ace stage the protostar continues to abridge , and its temperature - rise, which leads to the top of a thermonuclear re action . Pressure gas flowing from the star is balanced by the force of gravity, and gas sphere ceases to shrink. An proportion object - star. This star is a automatic system . If the knowledgeable temperature rises, the star swells . In turn , leads to modify of the star its compression and subsequent thaw , nuclear reactions in this are speed up . Thus, the temperature balance is restored. Protostar in the process of converting the star stretched for millions of years , which is relatively little outer space scales .'