Lernas

Lernas are a fictional species featured in the science fiction novel "Project Hail Mary" by Andy Weir. They are an extraterrestrial species encountered by the protagonist, Ryland Grace, during his mission to save Earth. Lernas are described as silicon-based lifeforms, meaning their biology is fundamentally different from carbon-based life, such as humans. Their physical form is vaguely insectoid, with multiple limbs and a tough exoskeleton.

A key characteristic of the Lernas is their ability to communicate through bioluminescent patterns emitted from their bodies. This visual language is complex and allows for a rich exchange of information. While initially perceived as a potential threat due to their alien nature, the Lernas are ultimately portrayed as intelligent and cooperative. They possess advanced scientific knowledge and are facing a similar existential crisis to humanity, which leads to an alliance between the two species. Their home world is known to be extremely hot and bathed in a star that emits a high level of ultraviolet radiation, conditions to which their silicon-based biology is well-adapted. The Lernas play a crucial role in the plot, providing the protagonist with essential knowledge and resources necessary to complete his mission.