Gitia

Gitia is a fictional planet featured in the science fiction novel "Project Hail Mary" by Andy Weir. It is the home world of the Eridians, an alien species encountered by the protagonist, Ryland Grace. Gitia is described as a planet orbiting a red dwarf star, which influences its environment and the characteristics of its inhabitants. The Eridians, who are also referred to as Gitans, have adapted to the dimmer light and different atmospheric conditions of their home system.

The planet Gitia plays a significant role in the narrative as it is the source of the Astrophage, a microscopic organism that threatens Earth's sun. The Eridians have developed a sophisticated understanding of Astrophage and have found a way to manage its impact on their own star. Their advanced scientific knowledge and technology are crucial to the novel's plot as Ryland Grace seeks their assistance to save humanity from the Astrophage plague. The interaction between humans and Eridians, stemming from the shared problem of Astrophage originating from Gitia, forms a central theme of the story.