diff --git a/ZeroSpace/ZeroSpace.Model/PlanetaryMasteryItemData.cs b/ZeroSpace/ZeroSpace.Model/PlanetaryMasteryItemData.cs
new file mode 100644
index 0000000..dd8b79b
--- /dev/null
+++ b/ZeroSpace/ZeroSpace.Model/PlanetaryMasteryItemData.cs
@@ -0,0 +1,8 @@
+namespace ZeroSpace.Model;
+
+public sealed record PlanetaryMasteryItemData(
+    string Id,
+    string Name,
+    IReadOnlyList<string> Levels,
+    string? ImageFileName,
+    string Body);