Dwarves rule the outer reaches

In news that'll make Hegs happy, Pluto's not a planet anymore. The folks in charge of that sort of thing have decided to be a planet you have to be:

Round

Orbit the Sun

And you must have cleared out all the crap in your neighborhood.

Since Pluto shares it's orbit/region of space with other objects, it's a dwarf planet, not a full on planet. So is Ceres and Pluto's cousing UB xxxxxx (whatever the damn serial numbers are on that thing). So now, we've got 8 planets and 3 dwarf planets in the solar system.

My question is - What do we do when the orc planets attack our peripheral defenders?