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The basic unit of game play is a single solar system but you can jump from system to system as you like. There are no game sessions that have to be started explicitly. You can seamlessly join and unjoin a gameserver at any time. But beware! While you are peacefully exploring the universe everyone else will try to shoot you down to advance their position in the roster of all-time Parsec legends. If you want to become a legend yourself, you will have to eliminate a lot of other spacecraft and still prevail to collect the honor.