..... 10 IT took Ross a while to learn a lesson, but when he learned it, it stuck. This time, he promised himself, no spaceport. They sneaked into the solar system that held fabulous old Earth from far outside the ecliptic, where the chance of radar detection was least; they came to a relative dead halt millions of miles from the planet and cautiously scanned the surrounding volume of space with their own radar. No ships seemed to be in space. Earth’s solar system turned out to be a trivial affair, only five planets, scarcely a half-dozen moons among them. None of the planets except Earth itself was anything like inhabitable. “Hold tight,” said Ross grimly, “I’m not so good at this fine navigation.” He cautiously applied power along a single vector; the starship leaped and bucked. He c