The second half of the story tells the heroic tale of how the space-bound Cheela, with a little help from the humans, eventually are able to land again on the surface, defeat the barbarian tyrant, and start to rebuild Cheela civilization.
The latter stages of the story portray the triumphant account of how the celestial Cheela, with assistance from humans, were able to set foot back on Earth, overcome the ruthless ruler, and embark on the path of restoring Cheela culture.