The short science fiction written solely by C. M. Kornbluth.
The officers began to sputter apologetically that it was late and the vault was sealed for the night— “That’s all right We’ll change it on Vega. It’ll get back to you. Call off your guards and unseal our ship.”
They followed the port officer to Starsong’s dim bulk out on the field. The officer cracked the seal on her with his club in the light of a flaring pressure lamp held by one of the guards.
Alen was sweating hard through it all. As they started across the field he had seen what looked like two closely spaced green stars low on the horizon towards town suddenly each jerk up and towards each other in minute arcs. The semaphore!