Similar to real solar systems, systems in this game are groups of Worlds orbiting a star. They have anywhere from 0 to 10 planets in them, all of which can be colonized. Each system has a system entrance, which is where explorers will transfer to when exploring new systems.

Systems can be named for 3 coins.

Navigation inside a system uses Local Coordinates.

The main stat of a star that is relevant to gameplay is its luminosity, it contributes to the temperature of the planets in the system. For comparison, the sun has a luminosity of 3.846 * 10^26 Watt.
For convenience the exploration interface at your colony expresses luminosity relative to that of the sun.