Free Astronomy Magazine July-August 2019

11 JULY-AUGUST 2019 ASTRONAUTICS running out. The Hadley-Apennine combination promised to be an optimal target for the study of the formation of Mare Imbrium, which in turn was the basis for the stratigraphic study of the Moon. But landing in this area would have been an operational challenge be- cause it would have involved flying over the Apen- nine, whose peaks are among the highest on the near side of the Moon and would A POLLO 15 − James B. Irwin works around the LRV. [NASA, Project Apollo Archive]