Official rule text
65.3 If a war sun is in a system with any number of other players’ 64 PLANETS units that have the “Planetary Shield” ability, those units are Planets provide players with resources and treated as if they do not have that ability. influence. Planets are on system tiles and each a Units treated as if they do not have a “Planetary Shield” has a name, a resource value, and an influence ability cannot use the “Magen Defense Grid” technology. value. Some planets also have traits. 1 b A war sun can use its “Bombardment” ability against
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Source: Twilight Imperium: Fourth Edition - Living Rules Reference: Prophecy of Kings
Expansion: Prophecy of Kings
Version: 2.0
Reference: Rule 65.3