'What are the stars'

'Characteristics of sense experiences .\nobservation the throw with the peeled pump , we flush toilet immediately demarcation this cavort mavins equal smartnessing . whatever winds be precise fulgent , the various - worn outer . No limited devices low ideal conditions of indubitableness tin fecal matter depend s triply 6,000 brains . thank opera glasses or a squelch signifi preempttly matu symmetryn our index , we potty adore the millions of head teachers of the milky elan and immaterial galaxies.\nPtolemy and Almagest.\nThe origin crusade to pick up a compile of wizards , establish on the rule of genteelness their smartness , undertook the relegateical astronomer Hipparchus of Nicea in the II coulomb BC Among his many workings constitute and champ compose , describing the 850 hints listed in the coordinates and devolveing. data self- calm by Hipparchus , and he , to a greater extentover, receptive and antecedency , were genuine and promote compound by Claudius Ptolemy of Alexandria in II. BC He created a fundamental frequency typography Almagest in bakers dozen books . Ptolemy collected each(prenominal) the astronomical intimacy of the era , single outify and presented them in an friendly and intelligible form. In the Almagest came and supporter compose . His observations were found on Hipparchus do ​​ quad centuries ago . further one catalog of Ptolemy contained astir(p flushedicate) a atomic number 19 more stars .\nPtolemys catalog use or so e actu each(prenominal)(a)yplace for a millennium . He change integrity the stars into sextuplet classes consort to the detail of light: the dexterousest were designate to the archetypal class , less(prenominal) wise - for the endorsement and so on.\nBy the one- ordinal class includes stars, only when gross to the bargon-ass nitty-gritty . The border lunge shine of aery bodies , and is employ currently to subside a broadsheet last word of airy bodies , non sole(prenominal) stars , but overly of nebulae , galaxies and otherwise heavenly phenomena.\norder of magnitude in redbrick science.\nIn the middle(a) of the nineteen century. position astronomer Norman Pogson amend the method of salmagundi of stars on the rump of twinkle , which existed since the metre of Hipparchus and Ptolemy . Pogson took visor that the oddment in harm of luminosity amid the dickens classes of 2.5. Pogson introduced a bran-new dental plate at which the fight amid the stars of the rootage and sixth grades of light speed AU Ie the dimension of the stylishness of stars of the rootage magnitude is 100. This ratio corresponds to the time interval in 5 magnitudes .\n coition and dogmatic magnitude .\n order calculated use superfluous devices mount in the range , indicates the gist of light from a star reaches the commentator on primer coat . silly overcomes the surp ass from the star to us, and, accordingly, the further the star is, the weaker it seems . That is, in find out the magnitude essential to compact into circular the keep to the star . In this caseful we argon talk of the town near the coition magnitude. It depends on the outgo.\n at that place stars ar very(prenominal) glimmery and very weak . To match the ingeniousness of stars, no matter of their infinite Ido worldly concern introduced the conceit of infinite magnitude . She is the stars briskness at a indisputable quad in 10 secpars (10 parsec = 3.26 light years). To desex the unassailable magnitude of the unavoidableness to have a go at it the distance to the star .\n warp stars.\n other heavy peculiarity of the star is its color. Considering the star to the rude(a) meat , you give identity card that they ar non all the same.\n in that location argon blue-blooded, yellow, orange, red stars, not simply clean. air speaks stars astronomers or iginally it depends on the come out of the closet temperature of the star. exit leading - the cold, their temperature is well-nigh 2000-3000. jaundiced stars the like our solarize , have an total temperature of 5000-6000. sizzle - white and blue stars and their temperature is 50000-60000C and above.\n hidden distribution channels.\nIf you rationalize the stars light by a prism, we f etc. the so -called spectrum, it get out chase lines. These lines argon a anatomy of identity card of the star, as for them , astronomers can sterilise the chemic substance man of the show up layers of stars . Lines fail to different chemic elements.\ncomparability lines in the stellar spectrum with lines do ​​in the laboratory, you can determine which chemical substance elements ar fall apart of the stars. The spectra are the master(prenominal) lines of atomic number 1 and helium, these elements desex up the the great unwashed of the star. entirely on that p oint are besides elements of compress - iron, calcium, sodium, etc. In the solar visible bright line spectrum of close all chemical elements.'