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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 Gravity Probe A ： ウィキペディア英語版 Gravity Probe A Gravity Probe A (GP-A) was a space-based experiment to test the equivalence principle, a feature of Einstein's theory of relativity. It was performed jointly by the Smithsonian Astrophysical Observatory and the National Aeronautics and Space Administration. The experiment sent a hydrogen maser, a highly accurate frequency standard, into space to measure with high precision the rate at which time passes in a weaker gravitational field. Large masses cause distortions in spacetime, which leads to the effects of length contraction and time dilation, both predicted results of Albert Einstein's Theory of General Relativity. Because of the bending of spacetime, an observer on Earth should measure a different rate at which time passes then an observer that is sufficiently high up in Earth's atmosphere, as there exists a weaker gravitational field further away from the center of the Earth. This effect is known as Gravitational Redshift. The experiment was a test of a major fallout of Einstein's General Relativity, the Equivalence Principle. The equivalence principle states that a reference frame in a uniform gravitational field is indistinguishable from a reference frame that is under uniform inertial acceleration. Further, the equivalence principle predicts that phenomena, such as length contraction and time dilation, that are present due to an inertial (uniformly accelerating) reference frame, will also be present in a stationary reference frame that is in a uniform gravitational field. The probe was launched on June 18, 1976 from the NASA-Wallops Flight Center in Wallops Island, Virginia. The probe was carried via a Scout rocket, and attained a height of 10,000 km (6,200 mi), while remaining in space for 1 hour and 55 minutes, as intended. It returned to Earth by splashing down into the Atlantic Ocean. ==Background== The objective of the Gravity Probe A experiment was to test the validity of the equivalence principle. The equivalence principle was a key component of Albert Einstein's theory of general relativity, and states that the laws of physics are the same regardless of whether you consider a uniformly accelerating reference frame or a reference frame that that is acted upon by uniform gravitational field. 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「Gravity Probe A」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.