Tissa

Tissa (Тисса): a planet in EN-63061 system. It is famous mostly for an incident that happened shortly after a FSG expedition discovered it. For some reason the members of the group couldn't establish a radio connection to any human world or spaceship except for their own mothership on the orbit of Tissa, and its computers kept telling them that Earth and all other human settlements were destroyed by global catastrophes and that they are the only remaining humans in the Universe. After the group was rescued, psychologists decided that this was a case of temporary madness or a mass suggestion. Tissa is only mentioned in The Time Wanderers. Discovered in 2193 AD.