[DragoZERO]

Also keep in mind that we didn't know the true effect a large object would have on the Earth 30 years ago. I think an asteroid would be more cataclysmic than a colony though because its one big piece.

And as for Char's Counterattack,

Spoiler for Char's Counterattack:

Axis has nuclear propulsion and such which would cause the nuclear winter.. maybe, I'm stretching here, I know.