Detail Home Away From Home; Another Earth?   Oleh:  [s.n] Jenis: Article from Bulletin/Magazine Dalam koleksi: The Economist (http://search.proquest.com/) vol. 401 no. 8763 (Dec. 2011), page 80. Topik: Extrasolar Planets; Astronomy; Research Ketersediaan Perpustakaan Pusat (Semanggi) Nomor Panggil: EE29.69 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada     Lihat Detail Induk Isi artikel One of the more memorable slogans to come out of the climate-change talks in Durban over the past few days is: "there is no planet B". But what if there were? Over the past couple of decades astronomers have logged thousands of so-called "exoplanets"--worlds which orbit stars other than the sun. On December 5th the scientists in charge of Kepler, a space telescope designed to look for such planets, confirmed their instrument's discovery of its first Earthlike world. It is dubbed, rather unromantically, Kepler 22b. The existence of this planet, which circles a star 600 light-years away, in the constellation of Lyra, had previously been suspected. It joins two other Earthlike planets--Gliese 581d and HD 85512 b--discovered by another instrument within the past few years. In truth, the term "Earthlike" is a stretch. Kepler 22b has a radius 2.4 times that of Earth, and if it is made from roughly the same stuff its surface gravity will also be about 2.4 times as strong. But NASA's astronomers remain unsure whether it is predominantly gaseous, liquid or solid. Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Kembali

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