When you need to call down the thunder to deal with those pesky biters, launch a rocket with an ion cannon into orbit and show the bugs who's boss.
Update for Factorio 2.1
When I try dropping an Ion Cannon into the Rocket Silo cargo slot while rocket is still building (no launcher ready), a text pops up:
"There is no point sending Ion Cannon to orbit"
Just an update: I can put fish into the rocket's cargo slot, but the rocket can't launch. At least, not automatically (did not try to press the launch button).
