The Orbital Defense Pod not only defends against enemy
planet busters, they also destroy enemy satellites. Build an
Orbital Defense Pod then go into the "Orbital And Space Status"
menu on the left. It will say which faction do you wish to attack
and a list factions who have built orbital improvements will appear.
Click on one. A list of satellites will appear on the right.
Click on one. Under the revolving planet, the "Attack"
button will appear. Click it to attack the satellite.