Accept ku and CTP. ALL enemy planets have REALLY bad defense and attack, the most on a planet being about 1k attack which a lv20 could get. ANY planet which I post as an enemy you should have no trouble getting though, ask me and i'll tell you exact details if you must.

Gas- Massive- Research: Extremely Abundant -Enemy

Gas- Massive- Research: Extremely Abundant -Enemy

Desert- Very Large- Artifact: Very Abundant -Unoccupied

Gas- Very Large- Research: Abundant -Unoccupied

Desert-Very Large Mining: Average -Unoccupied

Volcanic-Very Large Mining: Extremely Abundant -Unoccupied

Oceanic-Very Large-Artifact: Rich -Unoccupied

Gas-Very Large-Research: Abundant -Unoccupied

Icy- Very Large- Research: Very Rich -Enemy