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Spacegates serve two main purposes: creating an isolated "control" group of human cultures to observe cultural growth in isolation compared to galactic access, and orbiting planets not seeded or likely to be seeded with human life. Also, having a Spacegate rather than a Stargate makes it much easier for such a planet to be used as a meeting place as only the Ancients, and later the Wraith, had the ability to use them with Gateships and Darts, respectively.