Question and Answer (novel)
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Question and Answer is a science fiction novel by American writer Poul Anderson. It originally appeared in the June and July 1954 issues of magazine Astounding Science Fiction, and was later reprinted
Cover of the first edition.
Lagrange point
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In celestial mechanics, the Lagrange points, also called the Lagrangian points or libration points, are points of equilibrium for small-mass objects under the gravitational influence of two massive or
Question and Answer (novel)
…binary star system in the Messier 13 globular cluster with an Earthlike planet called Troas (or more informally, Junior) located at one of the system's Lagrangian points. An earlier expedition to Troas had suffered some mysterious disaster, and a second expedition was being mounted to determine if the planet was suitable…
The Lagrangian L2 point for the Sun–Earth system