The Jupiter Theft
Del Rey 
Synopsis: In the latter half of the 21st century, the two super-powers, China and the USA, are preparing a joint crewed mission to Jupiter. Already hampered by attempts by the communist government of China and the post ACWII authoritarian government of the US to spy on each other, the mission and all of humanity are apparently threatened with extinction as a powerful x‑ray source is detected headed towards the solar system at near light speed. The x‑ray source slows and goes into orbit around Jupiter. A probe gets a brief glimpse of the visitor before being fried by an energy beam: Jupiter has a new Earth-sized moon which is orbited by obvious artifacts.