Mars Seed

A fragment of the moon. A signal from Phobos. A silvery-white arc on the surface of Mars. Materials scientist Lin Wantang spent twenty years walking from the moon to Mars, but she was faced with a secret that was far older than she imagined - an alien relic that called itself a "seed", and an archive of civilization spanning three billion years. It starts talking. Write with molecules, pulse with blue light, and transform planets with ring structures. It says thank you. But humans chose another path.