Today, Richard Rael and Tony Riggs tell the story of American astronomer Edwin Hubble. He changed our ideas about the universe and how it developed. Edwin Hubble made his most important discoveries in ...
EXPLORATIONS -- a program in Special English by the Voice of America. Today, Richard Rael and Tony Riggs tell the story of American astronomer Edwin Hubble. He changed our ideas about the universe and ...
E·P·哈勃(Edwin Powell Hubble,1889-1953),美国天文学家。 1923至1924年在威尔逊天文台时,哈勃发现仙女座大星云的12颗造父变星,根据周光关系,推算出它们位于银河系以外,是与银河系一样的恒星系统,这一发现是哈勃成为星系天文学的奠基人。 1926年,哈勃提出河 ...
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