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Planets can have 3 different gravity ratings: low, normal, high. A race has tolerance to one gravity rating, and will receive production penalties on planets with a different gravity. The penalty is generally worse if you go higher than your race tolerance than if you go lower (see table below).

The penalty can be counteracted by researching the Gravitic Fields tech and building Gravity Generators on the affected planet.

Note: This does not show up in the research tree.

Production penalty on planet based on race gravity tolerance:
Low gravity tolerance Normal gravity tolerance High gravity tolerance
Low gravity planet 0% -25% -50%
Normal gravity planet 50% 0% -25%
High gravity planet 50% -50% 0%