New state-of-the-art chronologic measurements of rocks brought to Earth by Apollo astronauts reveal that many of the historical age determinations are erroneous. The new measurements presented by cosmochemist Lars Borg demonstrate that the Moon's mantle and crust formed contemporaneously between 4.33 and 4.38 billion years ago. Series: "Lawrence Livermore National Lab Science on Saturday" [Science] [Show ID: 35696]