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Messier 66 (also known as NGC 3627) is an intermediate spiral galaxy about 36 million light-years away in the constellation Leo. It was discovered by Charles Messier in 1780. M66 is about 95 thousand light-years across〔36.2 mly × tan( 9′.1 ) = ~96 kly. radius〕 with striking dust lanes and bright star clusters along sweeping spiral arms.〔 M66 is a member of the famous Leo Triplet a close group of galaxies that includes M65 and NGC 3628 It has a distorted appearance due to gravitational interaction with NGC 3628 and a lesser extent M65, about 800 million years ago. 〕 M66 is part of the famous Leo Triplet, a small group of galaxies that also includes M65 and NGC 3628. Four supernovae have been observed in M66.〔(【引用サイトリンク】url=http://www.cbat.eps.harvard.edu/lists/Supernovae.html )〕 ==History== Gravitational interaction from its past encounter with neighboring NGC 3628 has resulted in: * An extremely high central mass concentration; * A high molecular to atomic mass ratio; * A resolved noncorotating clump of H I material apparently removed from one of the spiral arms. This third result shows up visually as an extremely prominent and unusual spiral arm and dust lane structures as originally noted in the Atlas of Peculiar Galaxies.〔 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「Messier 66」の詳細全文を読む スポンサード リンク
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