Kreton, a character from the play "Visit to a Small Planet" by Gore Vidal, is an alien who talks about advanced topics like time, space, and planetary systems.
These concepts are mathematical, so he believes only a mathematician would truly understand the details about his solar system.
In "Dark They Were, and Golden-Eyed" by Ray Bradbury,
The characters see old cities on the Martian hills.
The discovery of these cities contributes to the sense of wonder and unease experienced by the colonists as they grapple with the changes occurring in their new environment.
