And yet this section of the Moon was in the night-time. The sun had passed it by. It should have been dark, pitch-dark, by the logic of the interplanetary space. Yet it wasn't. Everything instead was bathed in a cold greenish-blue light that covered the surface like the glow of a half-dozen full moons. He looked up. Directly in the center of the sky overhead was the source of the radiation. A great glowing ball of green and blue and white, a ball with a misty aura surrounding it, a globe that struck Robin instantly as familiar. It was the Earth. The home world, seen in all its glory, a giant full-moon Earth, continents and islands clearly outlined, a glory of pale colors, poles agleam with dazzling white ... it was a sight that momentarily stopped Robin in his tracks, hypnotized with wonder. The cord pulled him out of it, and on he dashed, looking about him in the pale Earthlight. The surface was thick with cosmic dust, here and there the rounded domelike surface of a congealed volcanic bubble. Cracks crossed and crisscrossed the surface, and Peter and he had to bound across many of them. He saw rising slightly above the surface a long rill of whitish substance, racing across the crater bottom. With a start he realized that that must be the glasslike roof of the great cleft he had so recently escaped from. Above, the sky was nearly black and myriad stars shone bright from the distance. The outlines of the surrounding mountains walled in the two boys as if they were pygmy boxers in a gargantuan ring. Robin was forcing the air from his nostrils, allowing the oxygen to rush into his lungs. He began now to feel the first faint chill of surrounding space. He realized that it must already be nearly a hundred and fifty below zero on the surface, probably even much more than that. He had to keep moving, keep moving. But it was getting colder. He felt the cold penetrate him as his suit radiated the warmth that was in it. Now he wondered what was happening outside. Something was obscuring his view. Was it mist he was passing through? He had heard of mist on the Moon's surface, but he had seen none when he had first emerged. Yet his vision was being obscured more and more by a cloudiness. He strained his eyes, suddenly realized that the mist was not outside, it was inside! The slight amount of vapor inside his helmet was beginning to frost up on the inside of his face plate. What Peter had feared was beginning to happen. Robin missed his footing, stumbled, not having seen the little ridge they had passed. Peter, now barely visible ahead of him, had not stopped. Robin felt the cord tighten as he slowed down, uncertain of where his feet were landing. He began to feel groggy, realized that he was becoming frightened. He gritted his teeth on the unpleasant air tube, said to himself, _Get a hold on, stay firm. Only a few more steps to go. Hang on! Hang on!_