Astrographical information

Milky Way

Out of universe information

"Ripple Effect"

P4R was the designation given to a planet in the Milky Way galaxy by the Tau'ri which was known to hold a Stargate. Upon returning from a mission on P4R, SG-1 discovers an SG-1 from an alternate reality has arrived at Stargate Command. (SG1: "Ripple Effect")

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