Mercury, the quick planet /
by Isaac Asimov.
- A Gareth Stevens children's books ed.
- Milwaukee : G. Stevens, 1989.
- 32 p. : ill. (some col.) ; 27 cm.
- Isaac Asimov's library of the universe .
Includes index.
Bibliography: p. 30.
Describes the characteristics of the small planet closest to the sun whose day is twice as long as its year.