I just remembered a group powerful enough and nuts enough to
flatten a planet with .1c projectiles (or asterioids for those of
you skeptics who say it won't work.)
The K'kree. They have the motive, the opportunity and the means.
After all, most of the time they go around blasting inhabited
planets to smithereens. (if they are carnivorous)
In most cases these are low tech planets that can not defend themselves.
There is one note that the first K'kree war of extermination lasted
ten years. I don't see why. The K'kree had TL9 Spacecraft.
All they had to do is push a few asteroids around. (or drop a 1Kl
lead brick on them @ .1C)
One nice dust cloud in the atmosphere will kill off most of the plants,
no plant's no herbivores, no herbivores, no carnivores... problem
solved.
Scott Kellogg
The Horde is assembling at the barder...