"[T]hey came back with these two photos. One from , which was ', which was the Earth rising over the surface of the moon... before they'd landed on the moon, and the other on , the last of the Apollo missions, where they had the... full disk, the fully illuminated disk... '. ...That was when people started referring to the Earth as a "Blue Planet" because you couldn't look at that and not see that it was blue... [T]hen we spent 50 years not talking about the blue."