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Dünya’ya En Yakın Gezegen Hangisidir? - HAKANSEYHAN
2019 senesinde Physics Today dergisinde piyasaya sürülen bir araştırmayla süregelen, ‘Dünya’ya en yakın gezegen hangisidir’ tartışması günümüzde hâlâ devam etmektedir. NASA’nın resmi internet sayfasında yer edinen bilginin aksine, en yakın gezegenin Merkür bulunduğunu ortaya koyan araştırma, bununla beraber birçok sual işaretinin ortaya çıkmasına neden olmuştur. Gelin şimdi meydana getirilen tüm emekleri beraber inceleyelim.
Her geçen yıl değişen teknolojinin birazcık daha gelişmesiyle beraber, uzaya dair yeni ve garip bilgiler öğreniyoruz. Bilhassa son yıllarda NASA ve Elon Musk’ın sahibi olduğu SpaceX ’in ortaklaşa iş ile meydana getirilen emekler, evrenimize dair birçok gizemin ortaya çıkmasını sağlıyor. Tüm bu emekler devam ederken, 2019 senesinde üç bilim insanı tarafınca piyasaya sürülen bir araştırma ise bilim dünyasında yeni bir pencereyi araladı.
Tom Stockman, Gabriel Monroe ve Samuel Cordner adlı üç bilim insanının geliştirdiği bir simülasyon, o güne kadar bilinenin aksine Dünya’ya en yakın gezegenin Merkür bulunduğunu ortaya koydu. NASA tarafınca meydana getirilen hesaplamalar ise resmi sitesinde de yer almış olduğu suretiyle, en yakın gezegenin Venüs bulunduğunu gösteriyor. Gelin tüm bu bilgiler ışığında ‘Dünya’ya en yakın gezegen hangisidir?’ sorusuna beraber yanıt arayalım.
Dünya’ya en yakın gezegen hangisidir?
Ulusal Havacılık ve Uzay Dairesi’nin (NASA) resmi internet sayfasında yer edinen bilgiye nazaran, Dünya’ya en yakın gezegen Venüs olarak gösteriliyor. Fakat, 2019 senesinde üç bilim insanı tarafınca gösterilen yeni bir araştırmada, Dünya’ya en uzun süre en yakın konumda kalan gezegenin Merkür olduğu açıklandı.
Bu üç bilim insanı tarafınca, Dünya’ya en yakın gezegeni daha net belirleyebilmek adına Python kullanılarak 10.000 senelik bir süreci baz alarak mesafeler üstüne tahminler meydana getiren bir simülasyon geliştirildi. Sonrasında bu simülasyon neticeleri, PCM (iki nesnenin yörüngelerini dairesel, eş merkezli ve eş düzemli olarak ele alma) ve geleneksel hesaplama şekilleri neticeleri ile karşılaştırıldı. Simülasyon neticeleri, geleneksel hesaplama şekilleri ile %300’e yakın farklılık gösterirken, PCM neticeleri ile %1’den daha azca bir sapma bulunduğunu ortaya koydu. Netice olarak, simülasyon gezegenlerin yörüngelerine nazaran konumlanmalarından dolayı, Merkür’ün Dünya’ya Venüs’ten daha yakın bulunduğunu ortaya koydu.
Peki bu ölçümler neye nazaran yapılıyor?
Güneş sisteminini detaylı olarak incelerseniz, hem Venüs’ün hem de Mars’ın Dünya’ya en yakın mesafelere haiz gezegenler benzer biçimde göründüğünü görebilirsiniz. Kısaca, Dünya-Mars ve Dünya-Venüs arasındaki averaj mesafeyi hesaplayarak ve peşinden gezegenlere ilişik yarıçapları birbirinden çıkartarak, Dünya’ya en yakın gezegenin Venüs bulunduğunu bulabilirsiniz.
Bu formül temel olarak yanlış olmasa da, yalnızca iki gezegen arasındaki mümkün olan en kısa mesafeyi ölçer. Özetlemek gerekirse, gezegenlerin yörüngeleri süresince Dünya’ya ne kadar yaklaşacağını ortaya koyar, fakat bu gezegenler yörüngeleri haricinde geçirdikleri süre içinde Dünya’dan oldukca daha uzak bir konumda olabilirler. Bu yüzden, Dünya’ya en yakın gezegeni bulmak için, gezegenlerin yörüngeleri süresince averaj mesafelerini dikkate almak gerekiyor.
Bu probleminin net bir cevabına ulaşmak için averaj olarak Dünya’ya en yakın gezegenin hangisi olduğuna bakmamız gerekiyor. Bunu hesapladığımızda da Merkür’ün aslına bakarsak Dünya’ya en yakın mesafede en oldukca süre geçiren gezegen bulunduğunu görüyoruz. Bunun sebebi ise güneş sistemimizde yer edinen tüm gezegenler içinde Merkür’ün en minik yörüngeye haiz olmasıddır. Kısaca, Merkür Dünya’ya hiçbir süre Mars yada Venüs kadar yaklaşmıyor olsa da, asla bu gezenler kadar uzaklaşmıyor.
Ek olarak, Merkür’ün haiz olduğu bu minik yörünge, güneş sisteminde yer edinen tüm gezegenlere en yakın gezegen olmasını da sağlar. Merkür’ün Dünya’ya olan uzaklağını hesaplarken kullanılan yöntem burada da geçerlidir. Merkür, güneş sisteminde yer edinen bu gezegenlere hiçbir süre oldukca fazla yakın olmasa da, oldukca uzak da değidir.
Peki Dünya’ya yakın olan öteki gezegenler nedir?
Venüs 39.79 milyon km Mars 55.65 milyon km Merkür 82.5 milyon km Jüpiter 591.97 milyon km Satürn 1.204.28 milyon km Uranüs 2.586.88 milyon km Plüton 4.293.37 milyon km Neptün 4.311.02 milyon km Yukarıdaki verileri NASA’nın yapmış olduğu çalışmalara nazaran derledik. Gezegenler arasındaki mesafeler, her gezegenin Güneş etrafındaki yörüngesinde nerede bağlı olduğundan devamlı olarak değişmektedir. Kimi zaman bu mesafeler yakın olurken kimi zaman de oldukça uzak olacaktır. Bunun sebebi gezegenlerin eliptik yörüngelere haiz olmalarından doğar. Örnek vermek gerekise Merkür gezegeni ile Dünya içinde mesafe en yakın noktada 82.5 milyon km’den en uzak nokta olan 216.3 km’ye kadar değişkenlik izah edebilir.
Kısaca herhangi iki gezegen, Güneş’in aynı tarafındayken en yakın noktada olurlar. Bu yüzden, iki gezegen arasındaki mesafeden bahsederken, aralarındaki averaj mesafe baz alınır. Bu mesafeler çoğu zaman kilometre, mil yada astronomik birimlerle (AU) temsil edilir. Aslına bakarsanız bu aşamada hesaplama farklılıklarından kaynaklı olarak, Dünya’ya en yakın gezegenin hangisi olduğu mevzusunda görüş ayrılıkları ortaya çıkıyor.
Dünya’ya en uzak gezegen hangisidir?
23 Eylül 1846’da Alman gökbilimci Johann Gottfried Galle tarafınca keşfedilen Neptün, Dünya’ya en uzak gezegendir. Mavimsi okyanus rengi sebebiyle deniz tanrsının adını almıştır. Neptün, Güneş’e Dünya’dan ortalama 30 kat daha uzaktır ve yörüngeyi tamamlaması ortalama 165 Dünya yılı sürer. Kendi ekseni çevresinde Dünya’dan daha süratli döndüğü için Neptün’de bigün yalnızca ortalama 16 Dünya saatidir.
1977 senesinde ABD Voyager programı kapsamında fırlatılan Voyager 2 uzay aracının Neptün’e erişmesi tam 12 yıl sürdü. Ulusal Hava ve Uzay Müzesi’ne nazaran, Neptün’ün atmosferindeki ısı averaj -225 Santigrat derecedir. Bunun en büyük sebebi ise Güneş’e oldukça uzak olmasıdır. Güneş’ten averaj 4,5 milyar kilometre uzaklıkta olan gezegenden gelen bir ışığın Dünya’ya erişmesi ile ortalama 4 saat sürmektedir.Dünya’dan ortalama dört kat daha geniş olan Neptün, 24,674 kilometre yarıçapı ve 49,244 kilometre çapı ile güneş sisteminde yer edinen en büyük dördüncü gezegendir.
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