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Who built the StarGates? No one knows. It was originally believed that the Goa'uld had constructed the StarGate network. Daniel Jackson theorizes that a race of aliens impersonating the Norse gods constructed the StarGates. The true origins of the StarGate are still unknown and the creators are simply called "The Ancients".
The StarGate contains nine lockable chevrons. Although the gate can accept up to nine chevrons, typically only seven of these are used when dialing from a gate. An eighth chevron has been activated on more than one occasion (thanks to the Asgard) and the extra chevron adds a new distance calculation to the existing points, like a different area code, but requires massive amounts of power to use. The purpose or function of the ninth chevron is still unknown.
The "SG" designation denotes that the team is a part of the StarGate program, while the number following the StarGate designation is to distinguish between separate StarGate teams. Certain teams have special duties within the StarGate program. Listed below are all special designation teams noted thus far in the series:
Special Team Designations:
SG-1 - Exploration Team, lead by Colononel Jack O'Neill
SG-2 - Exploration Team
SG-3 - Marine combat unit, lead by Colonel Makepeace.
SG-4 - Exploration Team
SG-5 - Marine combat unit
SG-6 - Search & Rescue
SG-7 - Scientific Corp.
SG-8 - Medical team, accompanies SG-3 during medical emergencies.
SG-9 - Diplomatic Corp., led by attorney Major Stan Kovachek.
SG-10 - Covert Operations
SG-11 - Engineering Corp.
Abbreviations for standard equipment
M.A.L.P. Mobile Analytic Laboratory Probe, which travels through the StarGate to unexplored offworld locations, determining whether or not it is safe for human teams to proceed through the StarGate.
D.H.D. Dial Home Device: an altar-like device which has engraved pads which correspond to the 39 symbols on the StarGate for which it was created, pressing central "eye" powers up the Gate and pressing the symbols on the DHD activates the chevrons on the StarGate.
G.D.O. Garage Door Opener: transmits a radio signal through the StarGate to open the iris placed over the StarGate on Earth.
F.R.E.D. Field Remote Expeditionary Device: carries supplies for field units on the other side of the StarGate. With six wheels, FRED can navigate almost any terrain.
T.E.R. Transphase Eradication Rod: detects objects operating in the light spectrum 180 degrees out of phase of human vision, like the alien race the Reetouh and the cloaking device designed by the Go'auld, Hathor.
As many cultures encountered by the SG teams are derived from ancient Earth cultures, a linguist is needed for each team, to be able to communicate with most of these cultures. SG-1 also has Teal'c along, a 90 year old Jaffa, who can communicate with all other Goa'uld language using races such as the Jaffa. Occasionally, SG teams even encounters a race, like the Asguard, who are technologically superior to humans and decipher English in order to communicate with the team.
