Everything you need to understand or teach The Borderland of Sol by Larry Niven.
In "The Borderland of Sol," from the collection Tales of Known Space, Beowulf Shaeffer finds himself marooned on Jinx, a bizarre egg-shaped planet with an ocean around its middle. He wants to go to earth, where his wife and children await him.
Spaceships have been disappearing for no discernable reason when entering or leaving the solar system, and therefore all flights to earth have been suspended. Beowulf's one hope lies with a "freighter...