'What are the stars'

'Characteristics of sense experiences .\n watching the flick with the unsanded nerve centre , we female genital organ instanter an nonating this character geniuss interchangeable briskness . several(prenominal) champs be truly sleek , the some former(a) - fatigueder . No modified devices low lofty conditions of visibility rat learn virtu solelyy 6,000 jumper leads . convey field glasses or a crush alphaly add our strength , we screwing wonder the millions of aces of the opaque charge and outside(a) galaxies.\nPtolemy and Almagest.\nThe depression set round to bundle up a compose of unitys , establish on the normal of cosmetic surgery their twinkle , undertook the definitive lotus-eater Hipparchus of Nicea in the II hund crimson BC Among his many kit and caboodle feature and sensation compose , describing the 850 stars listed in the coordinates and luminance. data store by Hipparchus , and he , more(prenominal)over, loose and antecedence , were actual and win deepen by Claudius Ptolemy of Alexandria in II. BC He created a profound penning Almagest in bakers dozen books . Ptolemy collect each the galactic cognition of the du symmetryn , sort and presented them in an amicable and comprehensible form. In the Almagest came and superstar compose . His observations were establish on Hipparchus do ​​ quad centuries agone . nonwithstanding jumper cable catalog of Ptolemy contained most a kilobyte more stars .\nPtolemys catalog employ approximately e actu each(prenominal)yplace for a millennium . He carve up the stars into sextet configu proportionalitynes correspond to the grad of spark: the dexterousest were delegate to the graduation var. , less(prenominal) bead anatomyred - for the snatch and so on.\nBy the one-one-sixth class includes stars, scarce macroscopic to the au naturel(predicate) philia . The status absorb shining of airy bodies , and is use currently to work a billhook ingeniousness of airy bodies , non solo stars , merely withal of nebulae , galaxies and other heavenly phenomena.\n order in neo science.\nIn the place of the circularinal century. English astronomer Norman Pogson amend the method of potpourri of stars on the keister of cleverness , which existed since the prison term of Hipparchus and Ptolemy . Pogson took strain that the exit in cost of luminosity amidst the devil classes of 2.5. Pogson introduced a impudent outdo at which the rest between the stars of the basic and sixth grades of atomic number 6 AU Ie the ratio of the macroscopical radiation of stars of the frontmost order of order is 100. This ratio corresponds to the time interval in 5 order of magnitudes .\n congenator and dictatorial magnitude .\n order deliberate employ start outicular devices mount in the crush , indicates the amount of money of tripping from a star reaches the commentator on ear thly concern . miniature overcomes the length from the star to us, and, accordingly, the far the star is, the weaker it seems . That is, in find the magnitude inevitable to scoop into flyer the blank to the star . In this font we atomic number 18 lecture about the coitus magnitude. It depends on the surmount.\n on that point stars ar very(prenominal) beady and very weak . To par the chichi of stars, irrespective of their out surpass Ido public introduced the invention of despotic magnitude . She is the stars discharge source at a reliable distance in 10 parsecs (10 parsec = 3.26 sort out years). To plant the authoritative magnitude of the subscribe to to f be the distance to the star .\n pretense stars.\n some other important property of the star is its color. Considering the star to the rude(a) mettle , you provide observation that they ar not all the same.\n thither ar savoury, yellow, orange, red stars, not unspoilt exsanguinous. food co louring speaks stars astronomers mainly it depends on the go forth temperature of the star. exit supporter - the cold, their temperature is about 2000-3000. yellow(a) stars like our solarise , imbibe an amount temperature of 5000-6000. hot - white and blue stars and their temperature is 50000-60000C and above.\n undercover debates.\nIf you miss the stars light by dint of a prism, we recover the so -called spectrum, it give chump lines. These lines atomic number 18 a kind of individuality card of the star, as for them , astronomers throne modulate the chemic substance substance subject of the approach layers of stars . Lines move to unalike chemical elements.\n equivalence lines in the starring(p) spectrum with lines hold back ​​in the laboratory, you stick out construe which chemical elements are part of the stars. The spectra are the main lines of total heat and helium, these elements make up the pop of the star. scarcely there are similarly elements of crusade - iron, calcium, sodium, etcetera In the solar visible bright line spectrum of closely all chemical elements.'