Andromeda is the home of a fictional civilization used to explain the limits of direct control across great distances. Its signal to Earth carries instructions for building and programming a computer, but the 200-year transmission delay makes any ongoing exchange impossible. The example illuminates the book’s account of genes: they shape survival machines in advance, while the machines make their own moment-to-moment decisions.

The Distance Problem

In the science-fiction example, the Andromedans want to spread their culture to distant worlds, but travel is ruled out by the speed of light and practical constraints. Broadcasting radio signals in all directions offers a wider reach, yet distance imposes an unavoidable delay: a message takes 200 years to travel from Andromeda to Earth. The delay is so great that a conversation would be futile; even a reply could not inform the senders about what had happened when their original signal arrived.

The example makes distance a limit on feedback, not merely a measure of separation. The Andromedans cannot learn whether Earth has received their message or adjust their instructions in response. They must send a complete program in advance and accept that events at its destination will unfold beyond their supervision.

The Broadcast and Its Consequences

The Andromedans assemble their instructions into one long coded message and broadcast it repeatedly, with a cycle lasting several months. Picked up by the Jodrell Bank radio telescope, the transmission is decoded; the computer is built and its program run. The instructions bring Earth close to dictatorship before the story’s hero destroys the computer with an axe.

The outcome emphasizes how much may follow from a message whose authors cannot intervene after sending it. The computer operates without the Andromedans’ immediate direction, and the information that it has been built could not reach them for another 200 years. Its actions are its own, even though its design and initial instructions came from far away.

The Analogy with Genes

The example distinguishes advance programming from control over each action. A programmer can equip a computer with rules and strategies, but once it is playing, the computer receives no moment-to-moment help from its maker. The genes similarly shape the construction of a survival machine, then remain passively inside it; they cannot seize the reins and direct each action as it happens.

This analogy supports a layered account of agency. Genes exert ultimate influence through the bodies and nervous systems they help build, while nervous systems make immediate decisions. The comparison does not make genes conscious planners: the book treats purpose-language as shorthand for the effects of natural selection, not evidence of intention. Andromeda’s unreachable senders make the distinction vivid: influence can be powerful without being continuous or responsive.