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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク List of space debris producing events ： ウィキペディア英語版 List of space debris producing events Major contributors to space debris include the explosion of upper stages and satellite collisions.〔 There were 190 known satellite breakups between 1961 and 2006.〔(AN ANALYSIS OF RECENT MAJOR BREAKUPS IN THE LOW EARTH ORBIT REGION )〕 By 2015, the total had grown to 250 on-orbit fragmentation events.〔 〕 There is estimated to be 500,000 pieces of debris in orbit as of 2012,〔 with 300,000 pieces below 2000 km (LEO).〔 Of the total, about 20,000 are tracked.〔(The Threat of Orbital Debris and Protecting NASA Space Assets from Satellite Collisions (2009) )〕 Also, about sixteen old Soviet nuclear space reactors are known to have released an estimated 100,000 liquid metal (NaK) droplets 800–900 km up,〔(IEEE – The Growing Threat of Space Debris )〕 which range in size from 1 – 6 cm.〔 The greatest risk to space missions is from untracked debris between 1 and 10 cm in size.〔 Large pieces can be tracked and avoided, and impact from smaller pieces are usually survivable.〔 == Recent events == On 3 February 2015, the 13th DMSP satellite of the US government—''DMSP-F13'', launched in 1995—exploded while in a sun-synchronous polar orbit leaving a debris field of at least 43 objects. The US Air Force Joint Space Operations Center at Vandenberg Air Force Base, California is monitoring the expanding debris field, and "will issue conjunction warnings if necessary."〔 〕 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「List of space debris producing events」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.