National Geographic : 1972 Feb
Back on the surface, next day, Worden's colleagues con tinue their exploration. "Down the ladder to the plains of Hadley," Scott says cheerily as the two men leave the LM to set off in the "trusty old Rover" for EVA 2. The crew has given informal names to the craters around Hadley site, and today's traverse takes them by some of the more whimsical (pages 240-41). There's Index, their major landmark, on a line with Matthew, Mark, and Luke. And there's Salyut, named for the Russian space station; Domingo, Spanish for Sunday, because that's the day for this traverse; and Fifty-four, for the year Dave Scott graduated from West Point. Prime goal for EVA 2 is the Apennine Front, about three miles south of the LM. At the base of Mount Hadley Delta, Scott marvels at the huge barren sweep above him and exclaims: "My, oh my! This is as big a mountain as I ever looked up." Presently he calls the CapCom. "Joe, this Rover is remarkable. I'm telling you, we have climbed a steep hill and we didn't even really realize it." They find themselves half a mile up the mountainside, on a 15-degree slope. With a magnificent view of the basin, the LM, and the surrounding peaks, they stop to make intensive examinations of the geology and to relay detailed information to earth. They also collect all-important samples of mountain material. They document each sample with descrip tions and photographs showing exactly how it looked. Partly Green-but No Cheese Two kinds of rock arouse particular interest. Irwin calls, "Come and look at this.... This is the first green rock I've seen!" A bit later, after finding another green rock, they debate whether it could really be green. Could it be simply the way light reflects from it? Could it be the gold-coated visors they use to cut the sun's glare? Irwin concludes, "It's a good story. I hope it is green when we get it home." And it is! The samples consist of bright-green glass beads in a matrix of grayish material-the first big pieces of green stuff yet seen on the moon (page 263). Shortly after this discovery comes an excited cry from Scott: "Guess what we just found! I think we found what we came for!" He is holding a piece of milky-white rock about the size of a fist, weighing about half a pound. "Crystalline rock!" Irwin exclaims. "Yes, sir! You better believe it!... I think we might have found ourselves something close to anorthosite!" Scott believes they may have spotted a very ancient fragment of the moon. Later examination on earth proves him right: The rock is anorthosite, and it is at least four billion years old (pages 244 and 265). The possible significance of this rock becomes clear when one recalls Dr. John Wood's hypothesis about the moon's evolution. Scott may indeed have found a piece of the pre-Imbrium lunar crust. 258 Meandering rilles near Prinz crater may have been formed by flowing lava or jets of gases from the interior.