402 - Ufos in der Galaxis
UFO's in the Galaxy
Clark Darlton

Unknown spheres four-kilometer big appear in the galaxy. Contact with Terran spaceships trigger spectacular explosions, leading Terran scientists to believe these ships are composed of anti-matter, and that they might be coming from an anti-matter universe.

An observation mission sent to the planet Salem reveals that the spheres do not seem hostile and seem to be looking for something.

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