901年的老照片：猎户大星云
2019 August 17 1901 Photograph: The Orion Nebula Image Credit: George Ritchey, Yerkes Observatory – Digitization Project: W. Cerny, R. Kron, Y. Liang, J. Lin, M. Martinez, E. Medina, B. Moss, B. Ogonor, M. Ransom, J. Sanchez (Univ. of Chicago) Explanation: By the turn of the 20th century advances in photography contributed an important tool for astrono...