"Here they come!" Leda's voice vibrated in the ears of the four men with her. They stood with their helmets touching so they could talk, eyes looking down the rugged sweep of Copernicus to the force which came running upward against them. At their backs, the brutal heights of rock climbed for the stars, but they stood in a recess between looming crags, as good a defensive position as they could hope for. "Eight, nine—" Rikard strained his eyes through the queer tricky light and shadow—the brilli