\n
\n\tBilim insanlar\u0131, bu uzak suyun en az\u0131ndan bir k\u0131sm\u0131n\u0131n D\u00fcnya’daki sudan tamamen farkl\u0131 bir t\u00fcrde oldu\u011funa dair kan\u0131tlar buldu. Kuiper Ku\u015fa\u011f\u0131’ndan D\u00fcnya’ya ula\u015fan bir avu\u00e7 toz taneci\u011finde, ilkel kimyan\u0131n izlerini ta\u015f\u0131yan ve uzun zaman \u00f6nce kaybolmu\u015f suyun kal\u0131nt\u0131lar\u0131 tespit edildi. Bu bulgu, G\u00fcne\u015f Sistemi’nin k\u0131y\u0131s\u0131ndaki su rezervinin G\u00fcne\u015f’e daha yak\u0131n b\u00f6lgelerde meydana gelen de\u011fi\u015fimlerden etkilenmeden bozulmam\u0131\u015f halde kald\u0131\u011f\u0131na i\u015faret ediyor.<\/p>\n
\n\tNASA Johnson Uzay Merkezi’nden gezegen bilimci Lindsay Keller liderli\u011finde y\u00fcr\u00fct\u00fclen ara\u015ft\u0131rmaya g\u00f6re bu durum, “gaz devi gezegenlerin y\u00f6r\u00fcngelerinin \u00f6tesinde, i\u00e7 G\u00fcne\u015f Sistemi maddelerinden b\u00fcy\u00fck \u00f6l\u00e7\u00fcde yal\u0131t\u0131lm\u0131\u015f b\u00fcy\u00fck bir a\u011f\u0131r su rezervinin varl\u0131\u011f\u0131na dair ikna edici bir kan\u0131t” olu\u015fturuyor.<\/p>\n
\n\tNept\u00fcn’\u00fcn y\u00f6r\u00fcngesinin \u00f6tesinde, G\u00fcne\u015f’ten yakla\u015f\u0131k 30 astronomik birim, yani D\u00fcnya ile G\u00fcne\u015f aras\u0131ndaki mesafenin 30 kat\u0131 uzakl\u0131kta yer alan Kuiper Ku\u015fa\u011f\u0131, G\u00fcne\u015f Sistemi’nin ula\u015f\u0131lmas\u0131 zor bir s\u0131n\u0131r\u0131n\u0131 temsil ediyor. Bug\u00fcne kadar insan yap\u0131m\u0131 \u00e7ok az uzay arac\u0131 bu so\u011fuk ve karanl\u0131k b\u00f6lgelere ula\u015fabildi. Oraya varmak y\u0131llar al\u0131yor; b\u00f6lgeye bir sonda indirmek veya D\u00fcnya’ya g\u00f6ndermek \u00fczere \u00f6rnek toplamak ise astronomik d\u00fczeyde zor ve maliyetli oldu\u011fu i\u00e7in \u015fimdilik tamamen ihtimal d\u0131\u015f\u0131 g\u00f6r\u00fcl\u00fcyor.<\/p>\n
\n\tBu durum bilim d\u00fcnyas\u0131 i\u00e7in \u00f6nemli bir engel te\u015fkil ediyor. \u00c7\u00fcnk\u00fc Kuiper Ku\u015fa\u011f\u0131’nda bulunan buz ve kaya par\u00e7alar\u0131n\u0131n, yakla\u015f\u0131k 4,5 milyar y\u0131l \u00f6nce G\u00fcne\u015f’i \u00e7evreleyen toz ve gaz bulutundan bir araya gelmesinden bu yana erken G\u00fcne\u015f Sistemi’nin en az de\u011fi\u015fime u\u011fram\u0131\u015f kal\u0131nt\u0131lar\u0131 aras\u0131nda yer ald\u0131\u011f\u0131 d\u00fc\u015f\u00fcn\u00fcl\u00fcyor.<\/p>\n
\n\tStratosferde toplanan toz tanecikleri uzay yolculu\u011funun izlerini ta\u015f\u0131yor<\/h2>\n
\n\tAncak bilim insanlar\u0131 i\u00e7in sevindirici olan \u015fu ki Kuiper Ku\u015fa\u011f\u0131’ndaki her madde orada kalm\u0131yor. \u00c7\u0131plak g\u00f6zle g\u00f6r\u00fclmese de G\u00fcne\u015f Sistemi kozmik tozla dolu bulunuyor. Her y\u0131l tahmini 5 bin 200 ton kozmik toz D\u00fcnya’ya ya\u011f\u0131yor ve bu tozlar\u0131n bir k\u0131sm\u0131 buraya ula\u015fmak i\u00e7in \u00e7ok uzun bir yol kat ediyor.<\/p>\n
\n\tKeller ve meslekta\u015flar\u0131, NASA’n\u0131n y\u00fcksek irtifa u\u00e7aklar\u0131 taraf\u0131ndan stratosferden toplanan materyaller i\u00e7inde her biri 10 ila 30 mikrometre \u00e7ap\u0131nda olan bu t\u00fcr 12 toz taneci\u011fi buldu.<\/p>\n
\n\tBu noktada D\u00fcnya’n\u0131n stratosferinden al\u0131nan mikron \u00f6l\u00e7e\u011findeki bir toz zerreci\u011finin Nept\u00fcn’\u00fcn y\u00f6r\u00fcngesinin \u00f6tesinden geldi\u011finin nas\u0131l anla\u015f\u0131ld\u0131\u011f\u0131 sorusu \u00f6ne \u00e7\u0131k\u0131yor. G\u00fcne\u015f Sistemi’nde bu durum tamamen yolculuk izleriyle belirleniyor. Gezegenler aras\u0131 uzayda G\u00fcne\u015f’ten yay\u0131lan g\u00fc\u00e7l\u00fc radyasyona kar\u015f\u0131 atmosferik bir koruma bulunmuyor ve G\u00fcne\u015f kaynakl\u0131 enerjik par\u00e7ac\u0131klar a\u00e7\u0131kta kalan tozlar\u0131 etkilemeden b\u0131rakm\u0131yor.<\/p>\n
\n\tG\u00fcne\u015f’ten gelen enerjik par\u00e7ac\u0131klar bir toz zerreci\u011finin i\u00e7inden ge\u00e7erken kristal kafes yap\u0131s\u0131ndaki atomlar\u0131n yerini hafif\u00e7e kayd\u0131rarak arkalar\u0131nda belirgin izler b\u0131rak\u0131yor. Mekanizmalar\u0131 farkl\u0131 olsa da bu durum, y\u00fckl\u00fc bir par\u00e7ac\u0131\u011f\u0131n sis odas\u0131ndaki buharda iz b\u0131rakmas\u0131na benziyor.<\/p>\n
\n\tBir mineral ne kadar fazla bu t\u00fcr iz biriktirmi\u015fse, gezegenler aras\u0131 uzayda s\u00fcr\u00fcklenerek o kadar uzun zaman ge\u00e7irmi\u015f oluyor. G\u00fcne\u015f’in y\u00f6r\u00fcngesinde d\u00f6nen tozlar, g\u00fcne\u015f \u0131\u015f\u0131\u011f\u0131n\u0131n uygulad\u0131\u011f\u0131 \u00e7ok hafif bir s\u00fcr\u00fcklenme kuvveti olan Poynting-Robertson etkisine maruz kal\u0131yor ve bu etki taneciklerin kademeli olarak enerji kaybedip sarmal bir y\u00f6r\u00fcngeyle G\u00fcne\u015f’e do\u011fru yakla\u015fmas\u0131na yol a\u00e7\u0131yor.<\/p>\n
\n\tBilim insanlar\u0131 bu radyasyon izlerini sayarak bir toz taneci\u011finin G\u00fcne\u015f Sistemi’nin en uzak noktalar\u0131ndan yolculuk edebilecek kadar uzayda zaman ge\u00e7irip ge\u00e7irmedi\u011fini hesaplayabiliyor. Keller ve ekibinin tespit etti\u011fi taneciklerdeki iz yo\u011funlu\u011funun, asteroit ku\u015fa\u011f\u0131ndan veya J\u00fcpiter ailesi kuyruklu y\u0131ld\u0131zlar\u0131ndan gelen tozlardan beklenenden yakla\u015f\u0131k 100 kat daha fazla oldu\u011fu belirlendi. Bu veri, s\u00f6z konusu taneciklerin Kuiper Ku\u015fa\u011f\u0131 kadar uzak bir b\u00f6lgeden geldi\u011fi g\u00f6r\u00fc\u015f\u00fcyle \u00f6rt\u00fc\u015f\u00fcyor.<\/p>\n
\n\tKil mineralleri ve a\u011f\u0131r oksijen izotoplar\u0131 eski suyun \u015fifresini \u00e7\u00f6zd\u00fc<\/h2>\n
\n\tTaneciklerin mineral bile\u015fimi ise bir ba\u015fka ipucu sunuyor ve ara\u015ft\u0131rmac\u0131lar\u0131n tespitine g\u00f6re kar\u015f\u0131la\u015ft\u0131klar\u0131 antik suyun s\u0131rr\u0131n\u0131 bar\u0131nd\u0131r\u0131yor. Taneciklerin karbon bak\u0131m\u0131ndan ola\u011fan\u00fcst\u00fc derecede zengin oldu\u011fu ve belirli karbonlu g\u00f6kta\u015flar\u0131n\u0131n yakla\u015f\u0131k d\u00f6rt kat\u0131 kadar karbon i\u00e7erdi\u011fi g\u00f6r\u00fcld\u00fc. Bu durum, taneciklerin G\u00fcne\u015f’ten uzakta, farkl\u0131 ko\u015fullar alt\u0131nda olu\u015ftu\u011funun bir ba\u015fka g\u00f6stergesi oldu.<\/p>\n
\n\tBununla birlikte taneciklerde ge\u00e7mi\u015flerine dair \u00f6nemli bir ipucu veren ba\u015fka bir unsur daha bulundu: kil. Taneciklerin bir\u00e7o\u011funda saponit ve serpantin gibi killerin yan\u0131 s\u0131ra suyun di\u011fer minerallerle kimyasal reaksiyona girerek bile\u015fimlerini de\u011fi\u015ftirmesiyle olu\u015fan hidratl\u0131 mineraller yer ald\u0131.<\/p>\n
\n\tBu bulgu, uzak ge\u00e7mi\u015fte bir noktada toz taneciklerinin koptu\u011fu ana g\u00f6k cisimlerinin i\u00e7inde s\u0131v\u0131 suyun bulunmu\u015f olmas\u0131 gerekti\u011fi anlam\u0131na geliyor. Kuiper Ku\u015fa\u011f\u0131 g\u00fcn\u00fcm\u00fczde donmu\u015f halde olsa da radyoaktif bozunma veya \u00e7arp\u0131\u015fmalar\u0131n \u00fcretti\u011fi \u0131s\u0131, ge\u00e7mi\u015fte bu buzlu g\u00f6k cisimlerinden baz\u0131lar\u0131n\u0131n i\u00e7 k\u0131s\u0131mlar\u0131n\u0131 suyu eritecek kadar \u0131s\u0131tm\u0131\u015f ve suyun \u00e7evredeki kayalarla reaksiyona girmesine olanak tan\u0131m\u0131\u015f olabilir.<\/p>\n
\n\tS\u00f6z konusu su uzun zaman \u00f6nce yok oldu ancak 12 tanecikteki mineraller, bir zamanlar bu su molek\u00fcllerinin par\u00e7as\u0131 olan oksijenin bir k\u0131sm\u0131n\u0131 b\u00fcnyesinde tuttu. Oksijen, atom \u00e7ekirdeklerindeki n\u00f6tron say\u0131s\u0131na g\u00f6re farkl\u0131l\u0131k g\u00f6steren ve izotop ad\u0131 verilen \u00e7e\u015fitli t\u00fcrlerde bulunuyor. En yayg\u0131n olan\u0131 sekiz proton ve sekiz n\u00f6trona sahip oksijen-16 iken, do\u011fada kararl\u0131 halde bulunan iki daha a\u011f\u0131r izotop daha yer al\u0131yor: sekiz proton ve dokuz n\u00f6tronlu oksijen-17 ile sekiz proton ve on n\u00f6tronlu oksijen-18. Bu izotoplar\u0131n g\u00f6receli oranlar\u0131, bir maddenin nerede ve nas\u0131l olu\u015ftu\u011funa ba\u011fl\u0131 olarak de\u011fi\u015febiliyor ve ge\u00e7mi\u015fine dair bir t\u00fcr kimyasal parmak izi b\u0131rak\u0131yor.<\/p>\n
\n\tKeller ve meslekta\u015flar\u0131 toz taneciklerindeki oksijen izotoplar\u0131n\u0131 \u00f6l\u00e7t\u00fcklerinde, daha a\u011f\u0131r t\u00fcrlerde al\u0131\u015f\u0131lmad\u0131k bir yo\u011funla\u015fma tespit etti. Ara\u015ft\u0131rmac\u0131lar, hidratl\u0131 mineralleri olu\u015fturan kimyasal reaksiyonlar\u0131 yeniden modelleyerek bu olu\u015fuma yol a\u00e7an suyun izotopik bile\u015fimini tahmin etmeyi ba\u015fard\u0131.<\/p>\n
\n\tElde edilen bulgular, minerallerin bu a\u011f\u0131r oksijen izotoplar\u0131n\u0131, s\u00f6z konusu izotoplar bak\u0131m\u0131ndan ola\u011fan\u00fcst\u00fc zengin olan sudan ald\u0131\u011f\u0131n\u0131 ve milyarlarca y\u0131l \u00f6nce d\u0131\u015f G\u00fcne\u015f Sistemi’nde var olan antik bir rezervin imzas\u0131n\u0131 korudu\u011funu ortaya koydu. Bu izotopik imza, erken G\u00fcne\u015f Sistemi’nin di\u011fer b\u00f6lgelerinde olu\u015fan karbonlu g\u00f6kta\u015flar\u0131ndan elde edilen su verilerinden belirgin \u015fekilde farkl\u0131 \u00e7\u0131kt\u0131. Bu durum, uzak Kuiper Ku\u015fa\u011f\u0131’ndaki suyun, G\u00fcne\u015f’e daha yak\u0131n yerlerde meydana gelen kar\u0131\u015f\u0131m ve kimyasal de\u011fi\u015fimlerden b\u00fcy\u00fck \u00f6l\u00e7\u00fcde yal\u0131t\u0131lm\u0131\u015f ayr\u0131 bir rezerve ait oldu\u011funa i\u015faret ediyor.<\/p>\n
\n\tSat\u00fcrn’\u00fcn kalkan g\u00f6revi ve D\u00fcnya’ya ya\u011fan kozmik tozlar<\/h2>\n
\n\tAra\u015ft\u0131rmac\u0131lar bu yal\u0131t\u0131m\u0131 neyin sa\u011flam\u0131\u015f olabilece\u011fine dair bir fikre de sahip: dev gezegenler. Ancak bu kez d\u0131\u015f G\u00fcne\u015f Sistemi’nin ilkel suyunun i\u00e7 G\u00fcne\u015f Sistemi’ne ge\u00e7mesini engelleyen bir kalkan g\u00f6revini J\u00fcpiter de\u011fil Sat\u00fcrn \u00fcstlendi.<\/p>\n
\n\tErken G\u00fcne\u015f Sistemi modelleri, Sat\u00fcrn’\u00fcn gen\u00e7 G\u00fcne\u015f’i \u00e7evreleyen gaz ve toz diskinde bir bas\u0131n\u00e7 t\u00fcmse\u011fi olu\u015fturarak maddelerin i\u00e7 k\u0131s\u0131mlara do\u011fru s\u00fcr\u00fcklenmesini yava\u015flatm\u0131\u015f veya tamamen durdurmu\u015f olabilece\u011fini g\u00f6steriyor. Dolay\u0131s\u0131yla Sat\u00fcrn, buz devleriyle birlikte G\u00fcne\u015f’e daha yak\u0131n dola\u015fan maddelerden farkl\u0131 bir izotopik imzaya sahip su rezervinin korunmas\u0131na yard\u0131mc\u0131 olmu\u015f olabilir.<\/p>\n
\n\tBilim insanlar\u0131 erken G\u00fcne\u015f Sistemi’nde a\u011f\u0131r oksijen bak\u0131m\u0131ndan zengin b\u00f6yle bir su rezervinin var oldu\u011fundan uzun s\u00fcredir \u015f\u00fcpheleniyordu ancak buna dair kan\u0131t bulmak olduk\u00e7a zordu. \u0130ncelenebilen g\u00f6kta\u015flar\u0131n\u0131n \u00e7o\u011fu, yo\u011fun kar\u0131\u015f\u0131m ve kimyasal de\u011fi\u015fimlerin orijinal izotopik imzalar\u0131 gizledi\u011fi b\u00f6lgelerden geliyor.<\/p>\n
\n\tOn iki toz taneci\u011fi ilk bak\u0131\u015fta az gibi g\u00f6r\u00fcnse de kat ettikleri mesafe ve toplanma bi\u00e7imleri dikkate al\u0131nd\u0131\u011f\u0131nda b\u00fcy\u00fck \u00f6nem ta\u015f\u0131yor. Keller ve New York Eyalet \u00dcniversitesinden ortak yazar George Flynn, 2022 y\u0131l\u0131nda yay\u0131mlad\u0131klar\u0131 bir makalede, i\u00e7 G\u00fcne\u015f Sistemi’ne giren gezegenler aras\u0131 tozun d\u00f6rtte biri kadar\u0131n\u0131n Kuiper Ku\u015fa\u011f\u0131’ndan gelmi\u015f olabilece\u011fini tahmin etmi\u015fti.<\/p>\n
\n\tD\u00fcnya’ya s\u00fcrekli ya\u011fan kozmik toz ya\u011fmurunun i\u00e7inde, yolculu\u011fun izlerini ta\u015f\u0131yan ve milyarlarca y\u0131l boyunca hayatta kalarak evlerin \u00e7at\u0131 oluklar\u0131na kadar ula\u015fan G\u00fcne\u015f Sistemi’nin en erken tarihine ait say\u0131s\u0131z ba\u015fka par\u00e7an\u0131n bulunabilece\u011fi belirtiliyor. S\u00f6z konusu ara\u015ft\u0131rma Science Advances dergisinde yay\u0131mland\u0131.<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"
Bilim insanlar\u0131, bu uzak suyun en az\u0131ndan bir k\u0131sm\u0131n\u0131n D\u00fcnya’daki sudan tamamen farkl\u0131 bir t\u00fcrde oldu\u011funa dair kan\u0131tlar buldu. Kuiper Ku\u015fa\u011f\u0131’ndan D\u00fcnya’ya ula\u015fan bir avu\u00e7 toz taneci\u011finde, ilkel kimyan\u0131n izlerini ta\u015f\u0131yan ve uzun zaman \u00f6nce kaybolmu\u015f suyun kal\u0131nt\u0131lar\u0131 tespit edildi. Bu bulgu, G\u00fcne\u015f Sistemi’nin k\u0131y\u0131s\u0131ndaki su rezervinin G\u00fcne\u015f’e daha yak\u0131n b\u00f6lgelerde meydana gelen de\u011fi\u015fimlerden […]<\/p>\n","protected":false},"author":1,"featured_media":49628,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,5],"tags":[],"class_list":["post-75963","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-genel","category-gundem"],"yoast_head":"\n
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Bilim insanlar\u0131, bu uzak suyun en az\u0131ndan bir k\u0131sm\u0131n\u0131n D\u00fcnya’daki sudan tamamen farkl\u0131 bir t\u00fcrde oldu\u011funa dair kan\u0131tlar buldu. Kuiper Ku\u015fa\u011f\u0131’ndan D\u00fcnya’ya ula\u015fan bir avu\u00e7 toz taneci\u011finde, ilkel kimyan\u0131n izlerini ta\u015f\u0131yan ve uzun zaman \u00f6nce kaybolmu\u015f suyun kal\u0131nt\u0131lar\u0131 tespit edildi. 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