You've come to own an unstable planet rich in resources. But this corner of space is full of asteroids that threaten to blast it to pieces, scattering those resources all over space. You'll have to defend it, building and upgrading turrets with the resources you gather and the money you make from it.

Cashing out might be tempting, but as long as you have the planet's gravity, loose bits of destroyed comets can fall back to it and be collected too - see how long you can keep the planet going and make as much money as possible