I'm new to Sins of a Solar Empire and I've played a couple of 1v1 games against the computer and have managed to figure out many of the basic elements of gameplay. However, some asteroid fields and other locations have asteroids and metal extractors but aren't colonizable. The extractors say they are invulnerable, but they can be captured. But I have been unable to find any way to capture them.
I feel certain that it must be a simple thing that I'm over looking, but it has me stumped. If anyone would be willing to shed some light on this for me, I would certainly appreciated it.