Stargate

Stellar gates use massive amounts of solar power in order to warp spacetime in such a manner as to literally reduce the distance beteen two such gates. Currently, seven are planned for the Solar System, each with the intent of reaching nearby, major star systems. The husks that will eventually make them are currently residing some distance outside Neptune's orbit, though only the Centaurus Gate is anywhere near completion.

The massive energy required for these hundred-thousand kilometer behemoths makes it nearly impossible to use them around a red dwarf star, as even with the aid of mobius patterns, the construction of seven gates will require well over half of the sun's energy, averaging a need for thirty yottawatts of power each.

The seven gates so far planned lead to the following star systems:

• Alpha Centauri - of course
• Tau Ceti
• 61 Cygni
• Procyon - tentative, depending on just how opposed to human presence the rogue artificial sapiences are
• Sirius
• Epsilon Indi
• Epsilon Erdani

Once completed, these will remain the seven largest megastructures created by human hands for some time.