{"id":30493,"date":"2018-10-31T01:01:04","date_gmt":"2018-10-30T22:01:04","guid":{"rendered":"https:\/\/bilimvegelecek.com.tr\/?p=30493"},"modified":"2018-10-31T06:55:46","modified_gmt":"2018-10-31T03:55:46","slug":"mars-bilimciler-metan-gizemini-cozmeye-daha-yakinlar","status":"publish","type":"post","link":"https:\/\/bilimvegelecek.com.tr\/index.php\/2018\/10\/31\/mars-bilimciler-metan-gizemini-cozmeye-daha-yakinlar","title":{"rendered":"Mars bilimciler metan gizemini \u00e7\u00f6zmeye daha yak\u0131nlar!"},"content":{"rendered":"

G\u00fcne\u015f\u2019in \u0131s\u0131tma g\u00fcc\u00fc, atmosferdeki metan gaz\u0131 seviyesinin mevsimsel olarak neden de\u011fi\u015fti\u011fini a\u00e7\u0131klamaya yard\u0131mc\u0131 olabilir.<\/p><\/blockquote>\n

Gezegen bilimciler Mars’taki metan bulmacas\u0131n\u0131 \u00e7\u00f6zmeye daha da yakla\u015f\u0131yorlar.<\/p>\n

Yeni hesaplamalar, NASA\u2019n\u0131n Curiosity gezgininin Mars’\u0131n atmosferindeki metan gaz\u0131 art\u0131\u015f\u0131n\u0131 neden kuzey yar\u0131mk\u00fcre yaz\u0131nda tespit etti\u011fini a\u00e7\u0131klamaya yard\u0131mc\u0131 olabilir. Kanada Toronto \u00dcniversitesi’ndeki bir gezegen bilimci olan John Moores, k\u0131\u015ftan bahara do\u011fru olan mevsim ge\u00e7i\u015fi s\u0131ras\u0131nda G\u00fcne\u015f’in \u0131s\u0131s\u0131n\u0131n, Mars topra\u011f\u0131n\u0131 \u0131s\u0131tmaya ba\u015flamas\u0131n\u0131n, metan gaz\u0131n\u0131n yerden atmosfere \u00e7\u0131kmas\u0131na izin verdi\u011fini belirtiyor. Moores, 24 Ekim\u2019de ki bir gezegenbilim toplant\u0131s\u0131nda \u00e7al\u0131\u015fmalar\u0131n\u0131 sundu.<\/p>\n

Curiosity\u2019nin metan \u00f6l\u00e7\u00fcmleri ara\u015ft\u0131rmac\u0131lar\u0131 y\u0131llard\u0131r cezbediyor. 2012’de Mars’\u0131n ekvatorunun yak\u0131n\u0131nda bulunan Gale kraterindeki y\u00fczey arac\u0131, kuzey yar\u0131mk\u00fcrenin ilkbahar\u0131nda atmosferik metan \u00f6l\u00e7\u00fcmlerinde gizemli ani art\u0131\u015flar tespit etti. Bu y\u0131l\u0131n ba\u015flar\u0131nda, tak\u0131mdaki biliminsanlar\u0131 metan d\u00fczeyinin kuzey yar\u0131mk\u00fcrenin yaz mevsiminde zirveye \u00e7\u0131karak, mevsimlere g\u00f6re metan seviyesinin artt\u0131\u011f\u0131n\u0131 ve azald\u0131\u011f\u0131n\u0131 belirledi.<\/p>\n

Mars’\u0131n atmosferinde metan gaz\u0131 bulmak olduk\u00e7a ilgi \u00e7ekici; \u00e7\u00fcnk\u00fc kimyasal reaksiyonlar yakla\u015f\u0131k 300 y\u0131l i\u00e7erisinde gazlar\u0131 yok etmeliydi. Bug\u00fcnk\u00fc varl\u0131\u011f\u0131, gezegendeki bir \u015feyin h\u00e2l\u00e2 gaz\u0131n atmosfere g\u00f6nderilmesini sa\u011flad\u0131\u011f\u0131n\u0131 g\u00f6steriyor. Kaynak, belirli kaya ve su t\u00fcrleri aras\u0131ndaki reaksiyonlar veya daha ilgin\u00e7 bir \u015fekilde g\u00f6m\u00fcl\u00fc mikroplar veya di\u011fer ya\u015fam \u015fekilleri gibi jeolojik s\u00fcre\u00e7ler de olabilir. D\u00fcnyan\u0131n atmosferindeki metan\u0131n \u00e7o\u011fu canl\u0131lardan gelir.<\/p>\n

Gaz s\u0131z\u0131nt\u0131s\u0131<\/strong>
\nAra\u015ft\u0131rmac\u0131lar, Mars’ta bulabilecekleri her metan kokusunu takip ettiler. D\u00fcnya \u00fczerindeki teleskoplar ve Mars’\u0131n y\u00f6r\u00fcngesindeki uzay ara\u00e7lar\u0131 zaman zaman gezegenin etraf\u0131ndaki metan gaz\u0131n\u0131 fark ediyorlard\u0131 (2009\u2019da yo\u011fun bir hava kirlili\u011fi de dahil olmak \u00fczere). Curiosity, do\u011frudan metan seviyelerini \u00f6l\u00e7erek bulmacan\u0131n \u00e7\u00f6z\u00fclmesine yard\u0131mc\u0131 olacakt\u0131 ama bunun yerine olaylar iyice karma\u015f\u0131kla\u015ft\u0131.<\/p>\n

\u015eimdi, cevab\u0131n Mars’\u0131n y\u00fczeyinde bulunabilece\u011fi g\u00f6r\u00fcn\u00fcyor. Moores ve meslekta\u015flar\u0131, metan\u0131n atmosfere girene kadar Mars topraklar\u0131ndaki k\u0131r\u0131klardan ve \u00e7atlaklardan nas\u0131l yukar\u0131 do\u011fru \u00e7\u0131kabilece\u011fini analiz etti. Topra\u011f\u0131n \u0131s\u0131t\u0131lmas\u0131, gaz\u0131n havaya s\u0131zmas\u0131na izin verebilir, bunlar\u0131n hesaplamalar\u0131 bu tezi do\u011frular nitelikte. Mars’ta mevsimler, \u00f6zellikle de Curiosity’nin gezegenin ekvatoruna \u00e7ok yak\u0131n olan konumunda biraz karma\u015f\u0131kt\u0131r. Ancak, en y\u00fcksek metan seviyeleri y\u0131l\u0131n en s\u0131cak zaman\u0131ndan sonra ortaya \u00e7\u0131k\u0131yor ve bu da yerin alt\u0131na do\u011fru yay\u0131lan \u0131s\u0131n\u0131n daha fazla gaz\u0131n sal\u0131nmas\u0131na izin verdi\u011fini g\u00f6steriyor.<\/p>\n

Biliminsanlar\u0131n\u0131n tahmin ettikleri atmosfere sal\u0131nan gaz miktar\u0131, Gale kraterinde Curiosity\u2019nin \u00f6l\u00e7mesi i\u00e7in iyi bir \u00f6rnek. Moores, Amerikan Astronomi Toplulu\u011fu Gezegen Bilimleri B\u00f6l\u00fcm\u00fc’n\u00fcn Knoxville, Tennessee’deki toplant\u0131s\u0131na verdi\u011fi deme\u00e7te: \u201cMetan\u2019\u0131n en b\u00fcy\u00fck kayna\u011f\u0131 h\u00e2l\u00e2 bir gizem. Ancak \u00e7al\u0131\u015fma, gaz\u0131n mevsimsel d\u00fc\u015f\u00fc\u015f ve y\u00fckseli\u015fini a\u00e7\u0131klamaya yard\u0131mc\u0131 olabilir.\u201d dedi.<\/p>\n

Derinliklerden<\/strong>
\nNASA’n\u0131n Maryland Greenbelt’teki Goddard Uzay U\u00e7u\u015f Merkezi’nde \u00e7al\u0131\u015fan bir gezegenbilimci olan Michael Mumma, \u201cBu fikir, G\u00fcne\u015f’ten yay\u0131lan \u0131s\u0131 sonucu Mars\u2019\u0131n u\u00e7urum y\u00fczeylerindeki \u00e7atlaklardan d\u0131\u015far\u0131 s\u0131zabilece\u011fine dair daha \u00f6nceki \u00f6nerilere dayan\u0131yor\u201d diye belirtti. Mumma ve meslekta\u015flar\u0131, 2009 y\u0131l\u0131nda yo\u011fun metan sal\u0131n\u0131m\u0131 hakk\u0131nda bilgi verdikten sonra, Mars topraklar\u0131ndaki g\u00f6zeneklerin belirli mevsimlerde u\u00e7urumlar veya krater duvarlar\u0131nda a\u00e7\u0131labilece\u011fini ve metan\u0131n y\u00fczeyden atmosfere sal\u0131nmas\u0131n\u0131 sa\u011flad\u0131\u011f\u0131n\u0131 ileri s\u00fcrd\u00fcler.<\/p>\n

Daha fazla ke\u015fif k\u0131sa bir s\u00fcre sonra gelebilir. Bir Avrupa-Rus uzay arac\u0131 olan ExoMars Trace Gas Orbiter (TGO), Nisan ay\u0131ndan beri Mars atmosferinde metan ve di\u011fer gazlar i\u00e7in adeta avlan\u0131yor.<\/p>\n

Toplant\u0131da Hollanda’n\u0131n Noordwijk kentindeki Avrupa Uzay Ajans\u0131\u2019ndan H\u00e5kan Svedhem, projenin y\u00fcr\u00fct\u00fcc\u00fcs\u00fcne uzay arac\u0131n\u0131n elde etti\u011fi ilk sonu\u00e7lar\u0131n yak\u0131nda yay\u0131nlanaca\u011f\u0131n\u0131 s\u00f6yledi. TGO, t\u00fcm gezegende ve belirli y\u00fcksekliklerdeki metan\u0131, Curiosity\u2019nin zeminde \u00f6l\u00e7ebilece\u011finin \u00e7ok daha \u00f6tesine ge\u00e7erek \u00f6l\u00e7\u00fcyor. Y\u00f6r\u00fcnge arac\u0131, Mars’taki metan gaz\u0131 sorular\u0131n\u0131n baz\u0131lar\u0131n\u0131 veya hepsini yan\u0131tlayabilir.<\/p>\n

Mumma, her ne kadar iddias\u0131n\u0131 detayland\u0131rmasa da \u201c\u015fa\u015f\u0131rt\u0131c\u0131 sonu\u00e7lar olacak\u201d, diyor.<\/p>\n

Kaynak:<\/strong> Witze, Alexandra, “Mars scientists edge closer to solving methane mystery”<\/a>, Nature, 25 Ekim 2018.<\/p>\n","protected":false},"excerpt":{"rendered":"

G\u00fcne\u015f\u2019in \u0131s\u0131tma g\u00fcc\u00fc, atmosferdeki metan gaz\u0131 seviyesinin mevsimsel olarak neden de\u011fi\u015fti\u011fini a\u00e7\u0131klamaya yard\u0131mc\u0131 olabilir. Gezegen bilimciler Mars’taki metan bulmacas\u0131n\u0131 \u00e7\u00f6zmeye daha da yakla\u015f\u0131yorlar. Yeni hesaplamalar, NASA\u2019n\u0131n Curiosity gezgininin Mars’\u0131n atmosferindeki metan gaz\u0131 art\u0131\u015f\u0131n\u0131 neden kuzey yar\u0131mk\u00fcre yaz\u0131nda tespit etti\u011fini a\u00e7\u0131klamaya yard\u0131mc\u0131 olabilir. Kanada Toronto \u00dcniversitesi’ndeki bir gezegen bilimci olan John Moores, k\u0131\u015ftan bahara do\u011fru olan […]<\/p>\n","protected":false},"author":1453,"featured_media":30494,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[30,19],"tags":[248,2802,3262,1057],"class_list":["post-30493","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astronomi","category-bilim-gundemi","tag-astronomi","tag-curiosity","tag-gezegen-bilim","tag-mars"],"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