The Ring of Charon (The Hunted Earth Series Book 1)

Boris Vallejo cover art. The first book of the 'Hunted Earth' saga. The story unfolds as an unknown alien race captures Earth with the use of a controlled wormhole, which was triggered accidentally by artificial gravity experiments issued from a human outpost in space. The story follows all three viewpoints: the Earth, the Solar System (sans Earth) and the alien race (Charonians).