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Messina Chasma is the largest canyon on the surface of the Uranian moon Titania and is named after a location in William Shakespeare's comedy Much Ado About Nothing.〔 The 1492 km long chasma is made of two normal faults running NW–SE, which bound a down-dropped crustal block forming a structure called graben.〔 The canyon cuts impact craters, which probably means that it was formed at a relatively late stage of the moon's evolution,〔 when the interior of Titania expanded and its ice crust cracked as a result.〔 Messina Chasma has only a few crater superimposed on it, which also implies it is relatively young structure. The chasma was first imaged by the Voyager 2 spacecraft in January 1986.〔 == References == 〕 〔 〕 〔 〕 }} 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Messina Chasma」の詳細全文を読む スポンサード リンク
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