QUOTE : the big, powerful ship was moving at the same rate as the asteroid below—47.05 miles per second. He came slogging back excitedly, put his eyes to the eyepiece. He gasped, and his big body shook with joyful ejaculations. “She checks down to the last dimension,” Bob chortled, working with slide-rule and logarithm tables. “Now all we have to do is find out if she’s made of tungsten, iron, quartz crystals, and cinnabar! But there couldn’t be two asteroids of that shape anywhere else in the Belt, so this has to be it!