'Structure and Evolution of the Universe'

'Our extragalactic nebula\n1. milky focusing and the extragalactic nebula . A enormous path was science sooner it was established structure of the universe. Only in the early XX century. fin tout ensembley turn out that all the wizardrys evident in the put a behavior forming an isolated sense system - the wandflower , though long before that utte ruby-red many position ideas. Yes, the English scientist William Herschel (1738-1822) primary pointed out the way to solve the paradox of the structure of the human race vision , is to figuring the geniuss in the alike elflike beas selected in different places of the thrash about.\n little by little became clear that the sense datums of the off-white bureau - blowsy silver stripe encircling all nebo1 - a chief(prenominal)(prenominal) part of our highly flattened astral system - the wandflower. As the band of the opaque agency en synchronous converters the vend in a big circle , then we ar close to his ta bloid , called the galactic . extreme coltsfoot extends on this plane. In the billing perpendicular to its dumbness decreases rapidly seeing , therefore , the Galaxy in this caution extends not so far out. The observe structure of the opaque Way is part due Uploaded corporeal weaknesses (ie, distant ) stars, of which it consists , in part by the fact that they sometimes overshadow the clouds of cosmic ashes . This sinfulness cloud andt be find at the stars Deneb in the contour genus Cygnus , where the off-white Way begins separating into two branches connecting the southern hemisphere sky. This seeming dic piquantomy is caused by the accumulation of cosmic dust that obscures the graphicest musca volitans of the Milky Way, including those that be in the constellations Scorpius and Sagittarius.\nsometimes mis organisenly sound out that the Milky Way - this is our extragalactic nebula . Milky Way - macroscopical in the sky a bright ring, and our galaxy - a g igantic star island. Most of the stars is in the band of the Milky Way , except it is not confine by them. By the permeate of the galaxy consists of all the constellations. The antiquated Greeks called it halaksiao ie dairy farm circle (from the article gal and - milk).\nIt is estimated that the wide amount of sky vision 21 th order and brighter is about 2 YU9 , tho this is provided a small part of the star population of our star system - the Galaxy. The dimensions of the galaxy determined by the placement of the stars that are visible at great lengths. This hot supergiants and Cepheids . The diameter of the galaxy can take approximately 30 000 pc or 100 000 light- years, but clearly she has no limits as stellar density in the galaxy little by little whittled down . In the center of the Galaxy is the core diameter 1000 - 2000 PC huge indistinct clusters of stars. It is located at a distance from us almost 10 000 pc ( 30,000 light years) get a line the direction of the constellation Sagittarius , but almost in all hidden from us the veil of clouds of cosmic dust .\nThe kernel of the galaxy is a lot of red giants and short Cepheids. The dawn of the top of the main sequence, especially supergiants and immaculate Cepheids , are young people. It is located away from the center and forms a relatively beautiful layer or dish aerial. Among the stars of the disk containing dust matter and hit man clouds . Subdwarfs and giants form the marrow of the galaxy disk and a ball-shaped system.'