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The Znamya project was a series of experimental orbital mirrors, designed to beam solar power to Earth by reflecting sunlight. It consisted of two experiments – the Znamya 2 experiment, and the failed Znamya 2.5 – and the proposed Znamya 3. The project was abandoned by the Russian Federal Space Agency after the failed deployment of the Znamya 2.5. ==Znamya 2== The Znamya 2 was a 20-metre wide space solar mirror. Znamya-2 was launched aboard Progress M-15 from Baikonur on 27 October 1992. After visiting the EO-12 crew aboard the Mir space station the Progress T-15 then undocked and deployed the reflector from the end of the Russian progress spacecraft on 4 February 1993, next to the Russian Mir space station. The mirror deployed successfully, and, when illuminated, produced a 5 km wide bright spot, which traversed Europe from southern France to western Russia at a speed of 8 km/second.() The bright spot had a luminosity equivalent to approximately that of a full moon.() Although clouds covered much of Europe that morning, a few ground observers reported seeing a flash of light as the beam swept by.〔Tim Folger, "New moon – Russian satellite acts as a mirror to light remote areas," ''Discover'', Jan, 1994 ((web version ), (accessed 29 August 2008))〕 The mirror was de-orbited after several hours, and burned up in atmospheric reentry over Canada.〔 〕〔 〕 The Znamya mirror had originally been designed as a prototype of a solar sail propulsion system,〔 but was repurposed as a space mirror for illumination when interest in solar sails flagged. 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「Znamya (satellite)」の詳細全文を読む スポンサード リンク
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