Astronauts and cosmonauts! When you finally reach Mars, please be very careful what you look like! In the shadows of a crater-wall on Phobos, moon of Mars, Grg and Yrl waited to greet the God. If the God continued its present rate of approach, it would land within moments. Grg and Yrl had journeyed all night, with their eyes on that distant glinting speck in the sky. Over cold-crusted sand dunes and jagged crater walls they had flowed, crept, bounded, oozed, toward the spot where the God must la