They're forbidden by the interstellar convention !

But. . . Why?!

We have to leave ! The alarm went off . . . They know we're here.

Now I understand how the conglomerate plans to take over the planet. If I ever get to their board room I swear I'll rip their heads off ! !

How does that thing work ?!

Dust mines have their own gravity engines. It's enough to lift them up to a altitude of about four kilometres and distribute them equally in the orbit and blow them up. A precipitation of active micro-particles will cover the entire surface in an even layer. In two-three years there won't be anything more complex than an amoeba on the planet. . . Then the conglomerate can move in.