These are the figures for earth citadel development.
Figures for the optimal resources production follow at the bottom of the page.

No Citadel
All planets start out without a citadel. This means that you will need to construct one in order to do much of anything on the planet. The only thing that you can do without a citadel is put fighters on a planet along with colonist and resources.
No Citadel	Level Requirements Colonist Needed Fuel Ore Organics Equipment Days Needed N/A N/A N/A N/A N/A

Level 1 Citadel
A level 1 citadel allows you to place money in the treasury and remain overnight on the planet. Beware the planet has no defenses though, and anyone can land and take your money and kick you out and kill you.
Level 1 Citadel	Level Requirements Colonist Needed Fuel Ore Organics Equipment Days Needed 1,000,000 300 200 250 4

Level 2 Citadel
A level 2 citadel introduces a planetary defense system, which all fighters left on the planet will defend when someone tries to land. A reaction level can be set, but the best odds would be to leave the miliary reaction level to 0%.
Level 2 Citadel	Level Requirements Colonist Needed Fuel Ore Organics Equipment Days Needed 2,000,000 200 50 250 4

Level 3 Citadel
A level 3 citadel comes with the addition of a quasar cannon on the planet. A quasar cannon does damage when someone tries to land on the planet. The level can be set for sector and atmospheric. Sector level does 1 damage per 3 ore, while atmospheric level does 1 damage per 1 ore.
Level 2 Citadel	Level Requirements Colonist Needed Fuel Ore Organics Equipment Days Needed 4,000,000 500 250 500 5

Level 4 Citadel
A Level 4 with now you can transwarp your planet around to anywhere you have a fighter down. No twarping a planet blind, but keep in mind that it takes 400 ore per hop for a planet, so keep it full or you may find your planet stranded somewhere.
Level 4 Citadel	Level Requirements Colonist Needed Fuel Ore Organics Equipment Days Needed 6,000,000 1,000 1,200 1,000 10

Level 5 Citadel
Finally, now you have a level 5 citadel. Once you get this citadel your planet is now "p-wave" dampered. This means that if photons are enabled in the game you are playing that a trader can't fire one into your sector and temporarily disable your quasar cannon. Now they will have to face the blast from your powerful cannon.
Level 5 Citadel	Level Requirements Colonist Needed Fuel Ore Organics Equipment Days Needed 6,000,000 300 400 1,000 5

Level 6 Citadel
Now you finally have the highest citadel possible. This citadel gives you the dreaded interdictor will prevent any unfortunate trader from leaving that ventures into your sector. It uses 50 ore each time the trader tries to leave, but if you have your sector quasar cannon enabled it might not be long before his escape pod will leave your sector!
Level 6 Citadel	Level Requirements Colonist Needed Fuel Ore Organics Equipment Days Needed 6,000,000 1,000 1,200 2,000 15

Total Resources/Days Needed to achieve a Level 6 Citadel

Colonist Needed Fuel Ore Organics Equipment Days Needed 6,000,000 3,000 3,300 5,000 43

Optimal Setup for Production of Resources

Item Colonist Colonist Daily Planet (1000s) 2 Build 1 Product Maximum Fuel Ore 10,000 3 3,333 100,000 Organics 0 7 0 100,000 Equipment 0 13 0 100,000 Fighters N/A 30 333 1,000,000

An earth planet isn't really good in my opinion for much of anything. It is not as worthless as other planets though, because it does have the best equipment production out of all the other planets. Some traders use this planet to produce equipment for their citadels, however I normally just buy mine. This is the best planet for producing equipment. It becomes overpopulated at 10,000 colonist, so it can't ever produce much of anything. Go with another planet if you can.

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