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Gök bilimciler, ‘Dünya’ya Yakın Nesne’ adı verilen bu cisimlerden bir tanesi olan 1950 DA’nın görüntüsünü yayımladı.</p> <p class="MsoNormal">Dünya’ya Yakın Nesne’lerden sadece yüzde 10’unun genişliği 1 kilometrenin üzerine çıkıyor. Teleskopların ilk olarak Şubat 1950 yılında tespit ettiği 1950 DA, 1.1 km’lik genişliğiyle bu cisimlerden bir tanesi.<br /> <br /> <strong>GEÇİŞ, 16 MART 2880 YILINDA </strong></p> <p class="MsoNormal">50 yıl ortadan kaybolan 1950 DA, 31 Aralık 2000 tarihinde yeniden ortaya çıktı. Ardından, Mart 2001’de yapılan radar ölçümleri, dönme hızı 2.1 saat olan (kendi etrafında tam tur) gök cisminin, 16 Mart 2880 yılında Dünya’ya çok yakın bir noktadan geçeceğini, hatta gezegenimize çarpabileceğini tespit etti.</p> <p class="MsoNormal">Discovery News’in haberine göre, 1950 DA’nın Dünya’ya ateşini hissettirecek yakın geçişi 20 dakika sürebilir. Bu geçiş esnasında, bir çarpışma olasılığı göz ardı edilemeyecek bir olasılık.</p> <p class="MsoNormal"><b style="mso-bidi-font-weight:normal">ÇARPARSA NE OLUR?</b></p> <p class="MsoNormal">Porto Riko’da bulunan Arecibo Gözlemevi, 1950 DA’nın Mart 2001’deki hareketi esnasında görüntüsünü yakalamayı başardı. Asteroidin o tarihte Dünya’dan uzaklığı 7.8 milyon kilometreydi.</p> <p class="MsoNormal">NASA’nın Jet İtiş Gücü Laboratuvarı tarafından 1950 DA üzerinde yapılan radar analizleri, 1950 DA’nın 2880 yılında Dünya’ya çarpma olasılığını 300’de 1 olarak öngördü.</p> <p class="MsoNormal">Bu olasılık kulağa çok yüksek gelmese de, Dünya’yı tehdit eden birçok asteroidin çarpma olasılığından en az yüzde 50 daha fazla. 300’de 1, çarpışma için verilen maksimum oran. Minimum ise yüzde 0 ile 0.33 arasında.</p> <p class="MsoNormal">En kötü ihtimalde Dünya’ya ne olacağı ise net: Çok büyük bir hasar. Asteroitin bileşenleri, çarpışma açısı ve hızı gibi birçok faktör hasarı etkileyecek faktörler. Yine de tahminler, yarım milyon megaton gücünde bir patlama yaşanacağı ve New York gibi bir kentin isabet alması halinde 150 km çap içindeki her şeyle beraber yeryüzünden silineceği yönünde.</p> <p class="MsoNormal">Patlama yaşanırsa, atmosferi saracak duman ve toz bulutu, Dünya’yı sarsacak tsunamiler ve yıkım, telafi edilmesi çok zor bir yara açabilir. Yine de en iyimser düşünce, 866 yıl sonra Dünya’yı tehdit eden asteroitleri önlemenin yollarına sahip olacağımız yönünde. 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