Co-authored with David Pelham:
- 1985: The Universe: A Three-Dimensional Study (pop-up book). Random House, ISBN 0-394-54691-1
Co-authored with Nigel Henbest:
- 1998: Is Anybody Out There? (Dorling Kindersley), ISBN 0-7894-2798-2
- 1999: Space Encyclopedia (Dorling Kindersley), ISBN 0-7894-4708-8
- 2001: Mars: The Inside Story of the Red Planet (Headline Book), ISBN 0-7472-3543-0
- 2001: Universe (Boxtree), ISBN 0-7522-7255-1
- 2007: The History of Astronomy (Firefly), ISBN 1-55407-325-1