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Kordylewski clouds are large concentrations of dust that may exist at the and Lagrangian points of the Earth–Moon system. They were first reported by Polish astronomer Kazimierz Kordylewski in the 1960s, but there is still debate as to whether they actually exist, due to their extreme faintness. They may be transient phenomena, as the and points are unstable, due to the perturbations of the inner planets. ==Discovery and observation== The existence of a photometrically confirmable concentration of dust at the libration points was predicted by Professor J. Witkowski in 1951. The clouds were first seen by Kordylewski in 1956. Between 6 March and 6 April 1961 he succeeded in photographing two bright patches near the libration point.〔 During the observation time the patches hardly appeared to move relative to L5.〔 The observations were taken from the mountain Kasprowy Wierch.〔 In 1967, J. Wesley Simpson made observations of the clouds using the Kuiper Airborne Observatory. The existence of the Kordylewski clouds is still under dispute.〔 The Japanese Hiten space probe, which passed through the libration points to detect trapped dust particles, did not find an obvious increase in dust levels above the density in surrounding space.〔〔 〕 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「Kordylewski cloud」の詳細全文を読む スポンサード リンク
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