Condition: Acceptable. Please see the images for more details.
Cover art:
Blurb: “"SEETEE (anti-matter) atoms are inside out, with negative nuclei and positive electrons.
An invisible difference-until they touch. Then unlike particles explode into free energy. That ultimate reaction makes uranium fission seem feeble as a safety match. Seetee is untouch-able." -Spaceman's Handbook
Seetee was untouchable, but Rick Drake had to touch it, handle it, and find some way to turn its potential energy to useful purposes instead of totally cataclysmic ones. With five forces-Earth, Mars, Jupiter, Interplanet, and the Aster-ites-each seeking an opening to upset the balance of power and become ruler of the solar system, the fate of the known universe hung in the balance: The answer lay within a mysterious alien object hovering in space-an object Rick had to enter, investigate, and try to understand.
And the creatures who had built it were beyond imagination...”