can i know if make a exotic mission if it adds richness or its only 13times mega rich obligated we canot change it sorry if its badly said im french and also i wana know this because that if it is usefull to max richness evrywere make a colosal and add another 13time mega rich on the planet ty in advance

The size and richness do not matter.
You get a massive 13x exotic.
Rings, moons, ruins, etc. will stay with the planet.
Structures and artifacts also stay on the planet.

so still if i have a 22time arti and evryting like this it will be back to 13 time mega rich and no more mega colosal

The mission exotic that you get from The Terra Project mission transforms the planet into an exotic with predetermined initial values for size and production. The details can be found here. You can increase both the size and production if you want. For example, you can use use a Quasi-Spatial Expander to increase its size to Very Massive and two Terraforming Devices to increase the production to 15x/15x/15x.

If you use the Hyper Terraformer Device on say a Colossal 20x/22x/20x the planet will shrink to Massive and the production will decrease to 13x/13x/13x.

so lets make a exotic whit a crapy planet is it a good idea plz

Yes, but not just any crappy planet. Try to find one that has rings or ruins. They are sold in the trading forum.

nvm dont need to respond over

kk no need for trading i will have a work soon