Seems like almost all planets have their upgrade already
Toxic has + 2 to mining
Volcanic has + 50 to attack
Gas has + 50 to attack
Icy has Melter + 2 to all resources and size
Desert has Crystalizer + 2 to resources and + 1 to size.
But i havent heard anything that will improve barren planet.
How about something that coverts it to a non-barren planet.

or adds to some of its resources

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