Birisi, evrenin bir par\u00e7as\u0131n\u0131 y\u0131rtm\u0131\u015f olabilir mi? G\u00f6ky\u00fcz\u00fcne bak\u0131p say\u0131lamayacak kadar \u00e7ok y\u0131ld\u0131z g\u00f6rd\u00fc\u011f\u00fcn\u00fcz\u00fc hayal edin. Ard\u0131ndan, hi\u00e7 beklenmedik bir \u015fekilde, teleskopunuzda y\u0131ld\u0131zlarla \u00e7evrili ve i\u00e7inde hi\u00e7bir \u015feyin g\u00f6r\u00fclemedi\u011fi siyah bir b\u00f6lge ortaya \u00e7\u0131k\u0131yor.<\/p>\n
Pek \u00e7ok y\u0131ld\u0131z\u0131n \u00e7evreledi\u011fi bu tekinsiz karanl\u0131k b\u00f6lge bir kara delik gibi g\u00f6r\u00fcn\u00fcyor olabilir ama ger\u00e7ekte \u00e7ok daha rahats\u0131z edici bir \u015fey. Uzayda \u2018Barnard 68\u2019 ad\u0131yla bilinen bu b\u00f6lge, hi\u00e7 \u015f\u00fcphesiz kozmosun en tenha, karanl\u0131k ve so\u011fuk b\u00f6lgesi.<\/p>\n
Yukar\u0131daki resim, Barnard 68\u2019in g\u00f6r\u00fcn\u00fcr ve yak\u0131n k\u0131z\u0131l\u00f6tesi foto\u011fraflar\u0131n\u0131n bir renk bile\u015fimi. Mart 1999\u2019da \u20188.2-m VLT ANTU\u2019 teleskobu ve \u00e7ok modlu \u2018FORS1\u2019 cihaz\u0131 vas\u0131tas\u0131yla \u00e7ekildi. Bu k\u00fc\u00e7\u00fck bulut, merkezinde bulunan toz par\u00e7ac\u0131klar\u0131n\u0131n engelleyici etkisi y\u00fcz\u00fcnden bu dalga boylar\u0131nda tamamen mat halde. Bilim insanlar\u0131, Barnard 68\u2019i bir \u2018siyah so\u011furma bulutsusu\u2019 ya da k\u0131saca \u2018SSB k\u00fcresi\u2019 olarak nitelendiriyorlar. G\u00fcney tak\u0131my\u0131ld\u0131z\u0131 olan Ophiuchus\u2019un (Y\u0131lanc\u0131) yak\u0131nlar\u0131nda, kendi galaksimizin i\u00e7inde ve yakla\u015f\u0131k 400 \u0131\u015f\u0131k y\u0131l\u0131 mesafede bulunan bu tuhaf karanl\u0131k par\u00e7a, D\u00fcnya d\u0131\u015f\u0131 bir medeniyetin evrenin dokusunu par\u00e7alad\u0131\u011f\u0131 bir yer gibi g\u00f6r\u00fcnebilir. Buna kar\u015f\u0131n, muhtemelen b\u00f6yle de\u011fil. Bile\u015fiminden \u00f6t\u00fcr\u00fc, Barnard 68 a\u015f\u0131r\u0131 derecede siyah ve so\u011fuk g\u00f6r\u00fcn\u00fcyor.<\/p>\n
Daha \u00f6nceleri g\u00f6ky\u00fcz\u00fcnde bir delik olarak kabul edilen \u015fey, art\u0131k g\u00f6kbilimciler taraf\u0131ndan karanl\u0131k bir molek\u00fcler bulut olarak g\u00f6r\u00fcl\u00fcyor. Burada, y\u00fcksek yo\u011funluktaki toz ve molek\u00fcler gaz, geri plandaki y\u0131ld\u0131zlardan yay\u0131lan g\u00f6r\u00fcn\u00fcr \u0131\u015f\u0131\u011f\u0131n hemen hemen hepsini emer. Bu \u00fcrk\u00fct\u00fcc\u00fc karanl\u0131k ortam, molek\u00fcler bulutlar\u0131n i\u00e7 b\u00f6lgelerini evrende bulunan en so\u011fuk ve en yal\u0131t\u0131lm\u0131\u015f alanlardan biri haline getirmeye yard\u0131mc\u0131 olur. Bu karanl\u0131k so\u011furma bulutsular\u0131n\u0131n en dikkat \u00e7ekici olanlar\u0131ndan biri, yukar\u0131da g\u00f6rseli payla\u015f\u0131lan ve \u2018Barnard 68\u2019 ad\u0131yla da bilinen Ophiuchus tak\u0131my\u0131ld\u0131z\u0131na yak\u0131n bir bulutsudur. Merkez b\u00f6lgede hi\u00e7bir y\u0131ld\u0131z\u0131n g\u00f6r\u00fcnmemesi, Barnard 68\u2019in k\u0131smen yak\u0131n oldu\u011funu g\u00f6sterirken, \u00f6l\u00e7\u00fcmler, yakla\u015f\u0131k 500 \u0131\u015f\u0131k y\u0131l\u0131 uzakl\u0131kta ve yar\u0131m \u0131\u015f\u0131k y\u0131l\u0131 geni\u015fli\u011finde oldu\u011funu ortaya koyuyor. Barnard 68 gibi molek\u00fcler bulutlar\u0131n nas\u0131l olu\u015ftu\u011fu hen\u00fcz tam anlam\u0131yla bilinmiyor fakat bu bulutlar\u0131n kendilerinin yeni y\u0131ld\u0131zlar\u0131n olu\u015fmas\u0131 i\u00e7in muhtemel adaylar oldu\u011fu biliniyor.<\/p>\n