{"id":47119,"date":"2018-07-27T18:40:20","date_gmt":"2018-07-27T16:40:20","guid":{"rendered":"https:\/\/osr.org\/?p=47119\/"},"modified":"2018-07-27T18:40:20","modified_gmt":"2018-07-27T16:40:20","slug":"yildizlari-saymak","status":"publish","type":"post","link":"https:\/\/osr.org\/tr\/blog\/astronomi\/yildizlari-saymak\/","title":{"rendered":"Y\u0131ld\u0131zlar\u0131 saymak…"},"content":{"rendered":"

Carl Sagan\u2019\u0131n iddialar\u0131<\/span><\/h2>\n

Amerikal\u0131 \u00fcnl\u00fc G\u00f6kbilimci Carl Sagan 1980li y\u0131llar\u0131n ba\u015f\u0131nda bir televizyon \u015fovunda b\u00f6yle bir iddiada bulunmu\u015ftu. Sagan\u2019a g\u00f6re, evrendeki y\u0131ld\u0131zlar, denizdeki kumlardan bile daha fazlayd\u0131. Bu tv \u015fovunun ad\u0131 ise Cosmos\u2019tu. O zamandan bu yana bir\u00e7ok ara\u015ft\u0131rma yap\u0131ld\u0131 ve bir\u00e7ok \u015fey s\u00f6ylendi. Ama y\u0131ld\u0131zlar\u0131n say\u0131s\u0131 asla bilinmedi.
\nBir\u00e7ok g\u00f6k bilimci ise bu iddian\u0131n do\u011frulu\u011funu merak etti ve kan\u0131tlamaya \u00e7al\u0131\u015ft\u0131 ya da b\u00f6yle bir \u015feyin hesaplanabilir olup olmad\u0131\u011f\u0131n\u0131 d\u00fc\u015f\u00fcnd\u00fc… ancak bu konuda da bir sonuca var\u0131lamad\u0131 ve bu hala tart\u0131\u015f\u0131lan bir konu olmaya devam ediyor.<\/p>\n

Bir say\u0131 vermek m\u00fcmk\u00fcn m\u00fc?<\/span><\/h2>\n

\u015eimdi ise Cambridge \u00dcniversitesi’nden Profes\u00f6r Gerry Gilmore, bizim d\u00fcnyada ya\u015fayanlar olarak, i\u00e7inde ya\u015fad\u0131\u011f\u0131m\u0131z ve g\u00f6rd\u00fc\u011f\u00fcm\u00fcz samanyolu galaksisi i\u00e7indeki y\u0131ld\u0131zlar\u0131 saymak m\u00fcmk\u00fcn diyor ve bunu da \u015fu an bir ara\u015ft\u0131rma olarak y\u00f6netiyor. Bunu bir proje olarak yapan Gilmore,\u00f6ncelikle g\u00f6ky\u00fcz\u00fcn\u00fcn ahritas\u0131n\u0131 \u00e7\u0131karm\u0131\u015f. Bu haritay\u0131 da Gaia teleskobuyla yapm\u0131\u015f.
\nYa\u015fad\u0131\u011f\u0131m\u0131z galaksinin i\u00e7inde toplam olarak ka\u00e7 tane y\u0131ld\u0131z\u0131n oldu\u011funu hesaplamak i\u00e7in Gaia teleskobunun ekibi de ellerindeki bilgileri ve verileri kullanarak Samanyolu Galaksisi’nin 3 boyutlu haritas\u0131n\u0131 \u00e7\u0131kartt\u0131<\/p>\n

200 milyar y\u0131ld\u0131z<\/span><\/h2>\n

Gilmore\u2019un BBC\u2019ye yapt\u0131\u011f\u0131 a\u00e7\u0131klamaya g\u00f6re ise Gaia’n\u0131n ilk toplad\u0131\u011f\u0131 bilgilerle birlikte 2 milyar adet y\u0131ld\u0131z tespit edildi. Bu y\u0131ld\u0131zlar, Samanyolu Galaksisi’ndeki y\u0131ld\u0131zlar\u0131n sadece y\u00fczde 1’ini olu\u015fturuyor, Gilmore\u2019a g\u00f6re.
\nGaia\u2019n\u0131n bu hesaplamas\u0131na g\u00f6re ise e\u011fer iki milyar y\u0131ld\u0131z toplam\u0131n y\u00fczde 1’ini olu\u015fturuyorsa, galaksi i\u00e7inde toplam 200 milyar y\u0131ld\u0131z var olabilir. Ancak bu say\u0131 sadece tek bir galaksiye ait.
\nPeki, evrende yer alan galaksilerin toplam\u0131nda ka\u00e7 y\u0131ld\u0131z\u0131n oldu\u011funu bulmak m\u00fcmk\u00fcn m\u00fc? Bu durum da \u015fu \u015fekilde a\u00e7\u0131lan\u0131yor: Samanyolu Galaksisi, klasik olarak g\u00f6sterilecek galaksilerden birisi ve bu nedenle de bir\u00e7ok galaksi de Samanyolu kadar y\u0131ld\u0131z var.
\nGilmore da bu durumun bir ortalama olarak kullan\u0131labilece\u011fini s\u00f6yl\u00fcyor. Bunun nedeni ise b\u00fcy\u00fckl\u00fck seviyesinde 100 milyar fazla y\u0131ld\u0131z\u0131n \u00e7ok az bir fark yarat\u0131yor olmas\u0131.
\nBuna g\u00f6re e\u011fer evrende ka\u00e7 galaksi var bilirsek, toplam y\u0131ld\u0131z say\u0131s\u0131n\u0131 da bulabiliriz. <\/p>\n","protected":false},"excerpt":{"rendered":"

Carl Sagan\u2019\u0131n iddialar\u0131 Amerikal\u0131 \u00fcnl\u00fc G\u00f6kbilimci Carl Sagan 1980li y\u0131llar\u0131n ba\u015f\u0131nda bir televizyon \u015fovunda b\u00f6yle bir iddiada bulunmu\u015ftu. Sagan\u2019a g\u00f6re, evrendeki y\u0131ld\u0131zlar, denizdeki kumlardan bile daha fazlayd\u0131. Bu tv \u015fovunun ad\u0131 ise Cosmos\u2019tu. O zamandan bu yana bir\u00e7ok ara\u015ft\u0131rma yap\u0131ld\u0131 ve bir\u00e7ok \u015fey s\u00f6ylendi. Ama y\u0131ld\u0131zlar\u0131n say\u0131s\u0131 asla bilinmedi. Bir\u00e7ok g\u00f6k bilimci ise bu iddian\u0131n […]<\/p>\n","protected":false},"author":23,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[506],"tags":[],"class_list":["post-47119","post","type-post","status-publish","format-standard","hentry","category-astronomi"],"acf":[],"yoast_head":"\nY\u0131ld\u0131zlar\u0131 saymak... - Online Star Register<\/title>\n<meta name=\"description\" content=\"Y\u0131ld\u0131zlar\u0131n say\u0131s\u0131n\u0131 bilmek m\u00fcmk\u00fcn m\u00fc? 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