Etana: Perbedaan antara revisi
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Pernah muncul hipotesis secara luas bahwa etana diproduksi dengan cara berikut di Titan: hujan turun ke permukaan bulan, dan dari waktu ke waktu telah terakumulasi menjadi lautan hidrokarbon yang banyak meliputi permukaan bulan. Observasi teleskopik inframerah memunculkan keraguan yang signifikan atas hipotesis ini, dan penyelidikan teropong Huygens, yang mendarat di Titan pada tahun 2005, gagal mengamati cairan permukaan apapun, meskipun foto itu merupakan foto saluran drainase kering saat ini.
It was once widely hypothesized[by whom?] that ethane produced in this fashion on Titan rained back onto the moon's surface, and over time had accumulated into hydrocarbon seas or oceans covering much of the moon's surface. Infrared telescopic observations cast significant doubt on this hypothesis, and the Huygens probe, which landed on Titan in 2005, failed to observe any surface liquids, although it did photograph features that could be presently dry drainage channels. In December 2007 the Cassini probe found at least one lake at Titan's south pole, now called Ontario Lacus because of the lake's similar area to Lake Ontario on Earth (approximately 20,000 km2). Further analysis of infrared spectroscopic data presented in July 2008[28] provided stronger evidence for the presence of liquid ethane in Ontario Lacus.▼
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