Hal Clement

Mission of Gravity is a sci-fi adventure story set on the planet Mesklin—a massive, rapidly rotating world with gravity much higher than Earth’s. It follows Barlennan, a Mesklinite, as he sails the Bree across the planet in search of a lost human rocket ship.

Close to Critical is the second book in the Mesklin series. It tells the story of a spaceship carrying the children of two ambassadors that crashes on an inhospitable planet, forcing humans to collaborate with the primitive native aliens to rescue them.

Star Light is the sequel to Mission of Gravity, and continues the theme of Human–Mesklinite exploration, this time focusing on a large star-like planet.