Star Trek: The Next Generation: Dyson Sphere by Charles Pellegrino and George Zebrowski

Two hundred million kilometers across, with a surface area that exceeds that of a quarter-billion worlds, the Dyson sphere is one of the most astounding discoveries the Federation has ever made. Now the U.S.S. Enterprise™ has returned to explore the awesome mysteries of the sphere. Intrigued by what is possibly the greatest archaeological treasure of all time, Captain Jean-Luc Picard hopes to discover the origin of humanoid life throughout the galaxy -- or perhaps the ultimate secret of the Borg.
But when a neutron star approaches on a collision course with the sphere, a mission of discovery becomes a desperate race against time. The many sentient species inhabiting the sphere face extinction -- can even the Starship Enterprise save them all?

Condition: acceptable. Normal wear on the edges. Some water spots on the inside of the front cover and the edges of the pages.