I see people constantly warring over planet and others never being used or discarded. So i would like to see way for planets teaming with life to go barren due to war ( planet being attack/taken to many times.) overproduction(causes planets turn toxic.), natural disasters ( a planet could change to a volcanic, desert, water,icy...). Or just the oppossite. A barrens could change up to a basic planet type ( due infrastructure being add , overproduction, warring) without a terraforming device. A downside to this some legions may just begin attacking all the time. Which could a change everything causing the balance of the universe to shift. A upside this may force legions to being to work together more to maintain the balance in the universe. Now from a business side. This may the increase the need for galaxy points to buy terraforming devices or even planetary fluxs.

this could be cool... but the planet type would only change. and while that would be nice so that multiple planetary evolution artifacts could be used, i would much prefer that if a planet is captured 3 times by the same person then the resource level would go down by 1, and if it drops below very sparse then they would not be able to recieve resources from it anymore (the same way gas giants ONLY get research and not artifact or mining.) it would prevent ppl from the green badge exploit, and it would encourage ppl to guard their planets more.

Hell! While you're at it, they should allow planets to be completly destroyed after, let's say 10 to 15 or maybe even 20 attacks. That'll really keep the green badging down to a minimum.

I suggest a pollution count for planets:

Planet types:
*Toxic starts at +20
*Ecumenopolis starts at +10
*Volcanic starts at +5
*Barren, gas, Desert, icy, aphotic, and metallic start at 0
*Terra, oceanic, and exotic start at -10
*Dyson starts at -20

Artifact use:
*every 10 artifacts used on a planet +1
*______ (a new artifact for reducing pollution) -1
*terraformers -3
*toxic purifiers -5 (and possibly used on planets other than toxic without raising mining level)
*using a planet-changing artifact (mass surface melter, dyson transformer, etc) -10

Invasion and development:
*for every development level above new +1
*when planets are invaded, they keep the previous pollution level
*this means that letting a planet develop between invasions will compound the pollution

Effects of pollution:
*max population of a planet decreases by 1% for every level above 0
*max population of a planet increases by 1% for every level below 0
*-1 to all building production (not production level) for every 10 levels above 0
*+1 to all building production (not production level) for every 10 levels below 0

I like this idea, but want to add 2 more to it.

+1 to pollution level to 'every' planet owned except exotic, dyson, gaia for every '7' days a player owns the planet.
Max 'negative' pollution level would need to also be capped at -20.

It would also be cool if we could get planetary events like on Master of Orion where a planet might be completely destroyed, evolve, go into civil unrest or otherwise be changed randomly 'every' week that a player owns a planet (5% chance of the event happening).

These changes would spice the game up because right now it get stagnant around level 200.

i disagree with your idea for compounding pollution for players that have owned planets longer than others. however, i do rather like you idea for 'events' which may or may not have been brought up before. however, they should only be bonuses to production, either positive or negative. i would be rather disappointed to see a 15x megarich mining planet be hit with a meteor and be completely destroyed...

as for evolving, i wouldnt mind a new stat that shows how well your colonists take to the planet. the better morale is the more citys they build, and the more populated it becomes, and could raise production and planet population by a specific amount, and add some passive attack and defense. personally, if earth got invaded i would at least TRY to resist the invasion. im not sure what our planets inhabitants are doing when they get invaded...

lol to be honest, i dont really like it :/ youll have to abandon the crappy planets every month or so , i dont have any galaxy points and when my planets resources run out . its over for me... :(

+1

you guys have a few nice ideas, but as a whole, it is not logical as it has been drawn out above.
i would suggest that only artifact richness would go down in the case of warring, because they would be destroyed by war; research wouldnt change much if any, because it is scientific and science and matter arent truly destroyed ever; and minerals are a constant and unchanging thing with the exception of the toxic purifiers adding to mineral richness, and mineral richness could also go up due to war, because of artifact materials deteriorating after war destruction and can still be salvaged as minerals, and the possibility of research going up because of this process, also possibly going down, but that may depend on the type of planet in question.

i would also suggest that certain planet types would be subject to change while others would not change; for instance a toxic wouldnt change from a toxic, and a barren may turn volcanic..

well, thats as far as i have thought this idea out cuz it is almost 5:am and i need sleep