Command the journey to the inner asteroid belt between Jupiter and Mars. Settle Asteroids and gather their ressources. You'll also have to maintain a fleet of space ships to defend your colony against pirates and other mining companies.
Space Fighters (and other Class I Ships) are able to land on the surface of asteroids.
This spares fuel and also is useful when you send a scout to a new asteroid to take some probes. It will land there, gather some samples and ring them to your colony for detailled analysis of expected resources.