In this novella, first published in 1957, a young couple, Gor Goginog and Rhitha, experience the great dual atomic explosion which ends the world, and smashes the planet to smithereens.
Cast into space on the last tiny green scrap of the Earth's surface, they encounter the only other remaining beings from the dead planet, a couple blown up to their scrap by the force of the blast.
Org is a composite creature, created by vivisectionists - part walrus, part fish, part bird - in fact made.