Gravity /
by John Hudson Tiner.
- Mankato, Minn. : Smart Apple Media, 2002.
- 32 p. : col. ill. ; 29 cm.
- Understanding science .
- Understanding science (Mankato, Minn.) .
Includes index.
Presents information on the scientific principle of gravity, how it was discovered, and how knowledge of its effects is applied by astronomers. Includes directions for a simple experiment.