1997 y\u0131l\u0131n\u0131n bir sonbahar sabah\u0131, insanl\u0131\u011f\u0131n Sat\u00fcrn\u2019\u00fc ke\u015ffetme yolunda \u00f6nemli bir ad\u0131m at\u0131ld\u0131. Cassini uzay arac\u0131, b\u00fcy\u00fck umutlar ve hedeflerle g\u00f6ky\u00fcz\u00fcne yolland\u0131, 20 y\u0131l sonra 15 Eyl\u00fcl\u2019de ise, g\u00f6rev sona erdirildi. Asl\u0131nda ilk g\u00f6nderildi\u011fi s\u0131rada tahminig\u00f6rev s\u00fcresi 3-6 y\u0131l aras\u0131ndayd\u0131. Sonras\u0131nda yeni ara\u00e7lar yollanmas\u0131 gerekti\u011fi d\u00fc\u015f\u00fcn\u00fclmekteydi. Ancak Cassini, bilimsel camiaya o bulundu\u011fu haliyle o kadar yard\u0131mc\u0131 oldu ki, b\u00f6yle bir duruma ihtiya\u00e7 kalmad\u0131. Cassini\u2019ye yol arkada\u015fl\u0131\u011f\u0131 eden Huygens, nihayet gezegenin y\u00f6r\u00fcngesine ula\u015ft\u0131klar\u0131nda Cassini\u2019den ayr\u0131larak Titan\u2019\u0131n y\u00fczeyine ini\u015f yapmay\u0131 ba\u015fard\u0131. Bundan sonra tek ba\u015f\u0131na yolculuk yapan Cassini ise Enceladus\u2019taki dev gayzerlerden Titan\u2019\u0131n atmosfersel yap\u0131s\u0131na kadar, Sat\u00fcrn\u2019\u00fcn uydular\u0131 hakk\u0131nda say\u0131s\u0131z bilgi edinmeyi ba\u015fard\u0131. Gezegen ile ana y\u00f6r\u00fcngeye oturdu\u011funda ise Cassini bizlere Sat\u00fcrn\u2019\u00fcn halkalar\u0131, kutuplar\u0131, manyetik alan\u0131 gibi birbirinden farkl\u0131 alanlarda bilgiler getirdi. Gezegenin y\u00fczeyinde kopan f\u0131rt\u0131nalara tan\u0131kl\u0131k ettik. Halkalar\u0131ndaki buz par\u00e7alar\u0131\u0131n\u0131n kimyas\u0131n\u0131 inceledik. Cassini uzay arac\u0131 sayesinde gaz gezegenler hakk\u0131nda bilinen pek \u00e7ok yanl\u0131\u015f d\u00fczeltilmi\u015f oldu. Fakat art\u0131k y\u0131llar ge\u00e7iyor, yeni teknolojiler ortaya \u00e7\u0131kmaya ba\u015fl\u0131yordu. Cassini\u2019nin ise zaman\u0131 her ge\u00e7en g\u00fcn daral\u0131yordu.<\/p>\n
Sat\u00fcrn gibi G\u00fcne\u015f \u0131\u015f\u0131\u011f\u0131n\u0131n D\u00fcnya\u2019ya k\u0131yasla \u00e7ok d\u00fc\u015f\u00fck enerjilerde ula\u015fabildi\u011fi yerlerde inan\u0131lmaz b\u00fcy\u00fckl\u00fckte G\u00fcne\u015f panelleri yapamad\u0131\u011f\u0131n\u0131z m\u00fcddet\u00e7e, G\u00fcne\u015f enerjisi elde etmeniz m\u00fcmk\u00fcn de\u011fildir. M\u00fchendislik ve maliyet kousundaki zorluklar g\u00f6z \u00f6n\u00fcnde bulunduruldu\u011funda, bu kadar geni\u015f paneller in\u015fa etmek yerine Cassini uzay arac\u0131na, Pl\u00fctonyum\u2019un \u00e7e\u015fitli izotoplar\u0131 ile \u00e7al\u0131\u015fan ufak bir n\u00fckleer santral konuldu. \u0130\u00e7ine konan miktar Cassini\u2019yi en az 20 y\u0131l boyunca \u00e7al\u0131\u015ft\u0131rabilecekti. \u0130\u015fte bu enerji, 2017\u2019de t\u00fckenmeye y\u00fcz tuttu. Uzay arac\u0131ndaki n\u00fckleer yak\u0131t, t\u00fcketildi\u011fi zaman at\u0131k haline gelir. N\u00fckleer at\u0131k ise uzun vadede Sat\u00fcrn\u2019e yap\u0131lmas\u0131 ama\u00e7lanan projelerde tehlike yaratabilirdi. Bu y\u00fczden NASA\u2019n\u0131n Jet \u0130tki Laboratuvar\u0131\u2019nda Cassini g\u00f6revi i\u00e7in \u00e7al\u0131\u015fan biliminsanlar\u0131, kendileri i\u00e7in zor bir karar verdiler: Yak\u0131t\u0131n\u0131n bitmesine yak\u0131n Cassini\u2019yi Sat\u00fcrn ile \u00e7arpt\u0131racaklard\u0131. B\u00f6ylece hem yak\u0131t\u0131 bitti\u011finde kontrols\u00fczce bir y\u00f6r\u00fcnge i\u00e7inde dolanacak olan ve ba\u015fka ara\u00e7larla \u00e7arp\u0131\u015f\u0131rsa b\u00fcy\u00fck sorunlara yol a\u00e7abilecek olan n\u00fckleer yak\u0131tlar ortadan kalkm\u0131\u015f olacakt\u0131, hem de Sat\u00fcrn\u2019den \u015fu ana kadar al\u0131nmam\u0131\u015f yak\u0131nl\u0131kta ve hassasl\u0131kta veri al\u0131nmas\u0131 sa\u011flanacakt\u0131. Karar verildi.<\/p>\n
15 Eyl\u00fcl g\u00fcn\u00fc Cassini, Sat\u00fcrn y\u00f6r\u00fcngesinde yapt\u0131\u011f\u0131 son d\u00f6n\u00fc\u015f\u00fc de bitirdikten sonra, sahip oldu\u011fu son yak\u0131t ile gezegenin y\u00fczeyine do\u011fru d\u00fc\u015f\u00fcr\u00fclmeye ba\u015flad\u0131. D\u00fc\u015ferken anbean foto\u011fraflar \u00e7ekti ve bas\u0131n\u00e7tan dolay\u0131 par\u00e7alan\u0131p veri g\u00f6nderemeyecek oldu\u011fu ana kadar foto\u011fraf elde ettik. Cassini\u2019nin bize g\u00f6nderdi\u011fi son foto\u011fraf, oda\u011f\u0131 bozulmu\u015f d\u00fc\u015f\u00fck kaliteli bir foto\u011fraft\u0131r.<\/p>\n
\u0130nsanl\u0131\u011f\u0131n G\u00fcne\u015f Sistemini ke\u015ffetme s\u00fcreci devam ettik\u00e7e, Sat\u00fcrn\u2019e \u00e7ok daha geli\u015fmi\u015f, ileri seviye uzay ara\u00e7lar\u0131 g\u00f6nderece\u011fiz. Fakat Cassini\u2019nin yapt\u0131\u011f\u0131 ara\u015ft\u0131rmalar ve cevaplad\u0131\u011f\u0131 gizemler asla unutlmayacak. Cassini art\u0131k Sat\u00fcrn\u2019\u00fcn bir par\u00e7as\u0131 oldu ve gezegene her bakt\u0131\u011f\u0131m\u0131zda onu hat\u0131rlayaca\u011f\u0131z. Bu miras hepimizin.<\/p>\n
Not:<\/strong> Yeri gelmi\u015fken Sat\u00fcrn, Ekim ay\u0131n\u0131n ilk on be\u015finde g\u00fcn bat\u0131m\u0131n\u0131n ard\u0131ndan iki saat kadar g\u00f6ky\u00fcz\u00fcnde \u00e7\u0131plak g\u00f6zle g\u00f6r\u00fclebilecek. \u0130lgililere duyurulur.<\/p>\n Kaynaklar<\/strong><\/p>\n – http:\/\/www.astronomy.com\/news\/2017\/09\/goodbye-cassini<\/p>\n – NASA bas\u0131n a\u00e7\u0131klamas\u0131: <\/strong>https:\/\/www.nasa.gov\/press-release\/nasa-s-cassini-spacecraft-ends-its-historic-exploration-of-saturn<\/p>\n","protected":false},"excerpt":{"rendered":" 1997 y\u0131l\u0131n\u0131n bir sonbahar sabah\u0131, insanl\u0131\u011f\u0131n Sat\u00fcrn\u2019\u00fc ke\u015ffetme yolunda \u00f6nemli bir ad\u0131m at\u0131ld\u0131. Cassini uzay arac\u0131, b\u00fcy\u00fck umutlar ve hedeflerle g\u00f6ky\u00fcz\u00fcne yolland\u0131, 20 y\u0131l sonra 15 Eyl\u00fcl\u2019de ise, g\u00f6rev sona erdirildi. Asl\u0131nda ilk g\u00f6nderildi\u011fi s\u0131rada tahminig\u00f6rev s\u00fcresi 3-6 y\u0131l aras\u0131ndayd\u0131. Sonras\u0131nda yeni ara\u00e7lar yollanmas\u0131 gerekti\u011fi d\u00fc\u015f\u00fcn\u00fclmekteydi. Ancak Cassini, bilimsel camiaya o bulundu\u011fu haliyle o kadar […]<\/p>\n","protected":false},"author":512,"featured_media":17811,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1130,30,19,26],"tags":[248,2118,2119],"class_list":["post-17810","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-164-sayi","category-astronomi","category-bilim-gundemi","category-fizik","tag-astronomi","tag-cassini","tag-saturn"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t