Introduces the force of gravity and discusses its effects and reasons for variations in its strength.
- ISBN10 0750224029
- ISBN13 9780750224024
- Publish Date 30 September 1999 (first published 10 February 1999)
- Publish Status Out of Print
- Out of Print 22 July 2002
- Publish Country GB
- Publisher Hachette Children's Group
- Imprint Hodder Wayland
- Format Hardcover
- Pages 32
- Language English