Spire

Cost of the 1st level:

15050120CRP 1.8
Necessary for exchanging signals with colonies outside your home planet. The maximum level of the Spire determines the maximum number of objects you can control:
+1 planet, temple or PPS per every 3 levels
+1 asteroid per every 3 levels
+1 satellite per level

The Spire is also necessary for sending a fleet from planets with any order.