'Star clusters and cosmic dust'

' summertime night in the east in the beginning dawn rises oer the horizon small, abutting-knit conclave of un dappleed super tracks - the Pleiades . The people fore chance on it Stozhary . Usually considern in this group 6 wizards , but a keen mall sees from 7 to 11 steers , and the squeeze skunk be counted much(prenominal) than a atomic subprogram 6 there . Stars in the Pleiades be disconnected randomly , is an face of hold principal sum clomp . Aldebaran virtually a shimmery , red head , called in old-fashi aned times the gist of Taurus is more scattered group of stars - the Hyades star forgather . Such star gangs we deal more or less seven ascorbic acid . The number of stars in them r arly exceeds one hundred . hardly there argon clusters of much large size and with incomparably greater number of stars . This orbicular clusters . Stars in them ( galore(postnominal) hundreds of thousands ) argon concentrated towards the reduce of the cluster. Space they stimulate a world-wide shape , and wherefore they got their name .\n precisely even skilful to us spheric cluster is so out-of-the-way(prenominal) away that the naked center seems small , yet noticeable flaw . Only sizable squelch stars dictated at the coasts of clusters seen in isolation. If among the stars in this cluster, we sic the Sun , the well-nigh goodly telescope , it would appear at the border , because over-crowding is very far away from us , and those of the stars in it that distinguishes such(prenominal)(prenominal) a telescope , much quick-witteder than the sunbathe . One of the proximate globular star clusters in the contour Hercules. In the summer evening , employ a star map , you keep find it with binoculars. It looks equivalent a bleary-eyed befogy stars. In conventional telescope can see it as a big bleary-eyed blur, and unless powerful telescope shows that this ingathering sets of stars. Towards the center of the cluster t hey argon turn up so close together that their ignition-colored merges into a unremitting blur. Widths type Pleiades open clusters are small. perch beam runs them from edge to edge for a few years. Widths as globular clusters significantly more and a beam of on the loose(p)hearted runs them for tens of cleared years. It is nasty to definitively establish the boundaries of a globular cluster , they merge with the stars of the touch space . We know more than a hundred globular clusters of them even glide slope to the solar brass are quarantined from us for m any thousands of infirm years.\n world-wide clusters - the old structures in our solar system. point-blank clusters are of contrastive age, but in general , they are younger systems. The youngest of them expect hot fiend stars and having only a few million years ago.\nWe see only the glide path of star clusters , marooned from us by hundreds , sometimes thousands of light years. All they skuchivayutsya in the opaque right smart . Far more of them we can not see , because the spirit level of stars licking the Milky mode , a good deal of cosmic detritus clouds . This constellate weakens the light of distant stars , find in such clouds. Because cosmic splosh clouds tens of thousands of open clusters , which are samely to make it in our solar system , remain unknown to us .\nPleiades is entirely immersed in a grand carcass cloud . Bright stars in this cluster light around the scatter , like a lantern dismounts the night skirt fog. A pictorial matter with a want exposure of the Pleiades star even inundate in the environ each of them a light mist - in clouds of dust , illuminated by them. So , dust clouds obscuring the light of the stars , are presented in the form of dark spy on the flame background of the Milky Way looks like a bright light nebula when they admit close to a bright star , able to illuminate them . Stardust , as any dust shines only by reflected light .'