Tannhauser Gate

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Tannhauser Gate, photographed prior to activation. In the background is the planet Yggdrasil.

An artifact of unknown origin, Tannhauser Gate has been orbiting at the Yggdrasil-Skuld L1 point for at least the last five thousand years. The object is a hexagonal ring with an inner diameter of twelve kilometers and a cross-section of 150m. It is composed of a mixture of basic light metals (mostly titanium and nickel), two transuranic elements previously unknown outside of high-energy particle accelerators, and an alien and seemingly inert strain of handwavium.

The discovery of Tannhauser Gate effectively aborted much of the Soviet expedition in order to focus on both the Gate and Yggdrasil. The Soviets initially believed that the artifact was produced by inhabitants of Yggdrasil, but a survey of the world revealed no signs of native intelligent life or civilization capable of building something that large.

Tannhauser's purpose was discovered by scientists aboard the Soviet ship Xenu Express, who noticed the artifact responded when probed with radio pulses sent at the right frequency. The Xenu Express managed to establish communication with the artifact's control system and succeeded in activating it. Once active, the artifact generated an immense gravitational force within the inner diameter which stabilized after several minutes into the terminal point of a wormhole.

Tachikoma-19028 (aka "Serge") volunteered to transit the wormhole's event horizon and see where, exactly, it led. Armed with everything the Xenu Express crew could find about the Gate's activation and deactivation protocols, Serge launched from the GCU Yuri Gagarin on October 15, 2013 and entered the wormhole. Six hours later, Serge returned through the event horizon with star sightings and other measurements that allowed the expedition to locate the other end of the wormhole in the Zeta (1) Reticuli system.

The Stargate Network

(for reference: Stargates, particularly ones close to Fenspace, get individual names)

Stargate	Origin	Links to
Tannhauser Gate	Delta Pavonis	Zeta (1) Reticuli
Night's Door	Zeta (1) Reticuli	Delta Pavonis, ??? (2 others)
Iconian Gate	Epsilon Eridani	unknown