单词：vasteras
斯特罗斯市（瑞典城市名）
单词：vasteras 相关文章
Combining Leavitt's cosmic yardstick with Vesto Slipher's handy red shifts, Edwin Hubble now began to measure selected points in space with a fresh eye. In 1923 he showed that a puff of distant gossamer in the Andromeda constellation known as M31 was
发表于:2019-02-25 / 阅读(78) / 评论(0)
万物简史
万物简史