Star Trek The Next Generation, book 50 : Dyson Sphere
Charles Pellegrino et George Zebrowski1999

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 USS Enterprise-D 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?