Aliens and extraterrestrials: are we alone? - Asimov, Isaac, 1920-; Walz-Chojnacki, Greg, 1954-; Asimov, Isaac, 1920- (Milwaukee : Gareth Stevens Pub., 1995)
Rev. ed. of: Is there life on other planets?, 1989.
Includes index.
Keywords: Life on other planets -- Juvenile literature; Cosmology -- Juvenile literature; Life on other planets