9167
This is related to the event in " SimEarth " where all cities are moved into rocket-propelled domes that then leave to " found new worlds " ( leaving no sentient life behind ) .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None