Question: For the Universe I am creating humanity has devolved into groups of scattered tribes. This is due to the fact that we ran afoul of a *really* nasty alien race, who decided to leave us homeless. A coalition of races had banded together to fight this menace, but mankind ended up with the short end of the stick. It is the Great *Diaspora*, and we are only hanging on by our fingernails.

The problem I am having is how to thoroughly destroy or at the very least render uninhabitable the places Man once called home. If it were only Earth it would be a simple enough matter, but by the time the attack takes place he *also* has colonies on Luna, Mars, Ceres, Callisto, and Titan. How can I muck them up badly enough that we have to now seek a Promised Land elsewhere?

Ceres I figure is small enough it could just be reduced to rubble, but what about Luna? If you destroy the colony there, what would prevent them from setting up new ones a few hundred miles away? 

At the moment all I can think of is a "Gray Goo" weapon, short of blasting multiple planets and moons to smithereens. I am hoping there is another option out there I haven't considered.

EDIT: I'd like to hold onto the Sun. You know, sentimental reasons. :)

Answer: 
**Rocks**

Simply put you throw rocks at stuff you don't like.

Fortunately our solar system is *full* of rocks just waiting around doing nothing, so we just grab a few (OK, more than a few) and direct them gently at the source of the problems (any inhabitable place) and wait for nature (and gravity) to takes it course.

In the due course of time you can not only wipe out all life, but ensure it won't be producing or supporting any life for millions of years.

Everyone wins.
A small stream of [strangelets](https://worldbuilding.stackexchange.com/a/113655/21222) in a series of flyby trajectories around the sun will do the trick. As long as the sun is not touched, it is safe. Everything else becomes lethal to the touch.

Since the ΔV from even Mercury to the Sun is immorally huge, the sun should be safe. Add to that, solar wind pushes stuff away from it... Over millenia other stars around the sun will be disassembled, but the Sun will be fine.

As for the Earth, Moon, asteroids, comets... Each and every one of them will disintegrate. [Wikipedia, for example, says this could happen if even one strangeled touched the Earth:](https://en.wikipedia.org/wiki/Strangelet)

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> This "ice-nine"-like disaster scenario is as follows: one strangelet hits a nucleus, catalyzing its immediate conversion to strange matter. This liberates energy, producing a larger, more stable strangelet, which in turn hits another nucleus, catalyzing its conversion to strange matter. In the end, all the nuclei of all the atoms of Earth are converted, and Earth is reduced to a hot, large lump of strange matter, the size of an asteroid.
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