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And a final tidbit... the solar satellite is quite useful!

One of them will produce energy for an entire colony, seriously reducing the costs of having them as you no longer need to build powergenerators.

You get them a bit late in the game though. And you don't really need colonies beyond Mir and Penelope. (And the brief one on Antares 3 of course. And one of Phoenix 2 if you want to invent the Radiationshield, but I digress)

You do however end up with colonies on Mirach 3, Orionis 3, Lyrae 5 and Lyrae 7 as you conquer these worlds, so if you want to keep those. (If nothing else for extra tax incom.) Give them a solar satellite!