You could just increase the price scaling of the colonization tech to prevent too many colonies.

There will always be turtles AND miners AND fleeters

But Giving Players This Ability Will INCREASE Miners Madly
and Ok Do Then , New Server Will be Worst Server

How about a limited number of planets. Like 11 but you may only have 1 to start with and must unlock each additional one up to 11 with colonization tech. Infinite planets is a bad idea as is planet destruction. Once number 1 because 4x number 2 they will have a huge advantage from planet destruction

Personally, I like the idea of having a set number of planets available to start without any need to research colonization tech. But I think after the first 15-20 planets have been settled, colonization tech for unlocking an additional 10 planets or so is not a bad idea. Why I would like to see quite a few planets immediately available is because it will allow players to spread out quickly at minimal expense, and it will allow those who start later to colonize good raiding locations with greater ease and get mines up and running more quickly, without the added hurdle of unlocking additional levels of colonization tech until they are really established.

What level of nanite do each of you have, the maximum that ANY of you have?

Have you gotten to a certain level and basically you have gone as far as you can because A: you don't need any farther level, or B: The costs have become so prohibitive that it's not an option as it's now too expensive?

Or, put it another way.

Take a chessboard. Put a penny (or whatever currency you use, the smallest denomination) on the first square.

On the second square, but two pennies. Third square four pennies, fourth eight pennies, and so on. Get to the last square (for those of you that don't play chess, there are sixty four squares), How much money would you have?

I see the number of colonies becoming so expensive that past a certain point players will not be able to build/afford anymore anyway. If the suggested formula that was posted earlier was to be instigated then I would think that there would be a natural cut off point for the number of colonies possible.

a uni with 499x9 like x theres 67,365 slots so 21 slots each means just under 3000 players just put it unless a bigger map can be made 21 slots is good and dont forgot add 21 moons thats 42 u have to look afler i like it getting tech or given or in the middie get some tech some, we could have unlimted but like the idea of taking somelses planet this could be done by using a ship that lands on the players planet a time limt say 8 hours give them a chance to kill the ship just a idea theres 6 in a allies one or two menbers can help smaller ones get planets off bigger players just add more to the game

To answer oz...
Nanite Factory (Level 13)
The nanite factory increases production speed on ships, defenses and structures by x2 per level.
Resources Needed : Metal: 8.192.000.000 Crystal: 4.096.000.000 Deuterium: 819.200.000
Construction Time : 04h 41m 15s