 What can be inferred from the passage about Jorgensen's Worlds?
THE FROZEN PLANET By Keith Laumer [Transcriber's Note: This etext was produced from Worlds of If Science Fiction, September 1961. "Two double planets, all rather close to an unimportant star listed as DRI-G 33987. They're called Jorgensen's Worlds, and in themselves are of no importance whatever. Since they've met no opposition so far in their infiltration of Terrestrial space, they intend to seize Jorgensen's Worlds by force." Magnan leaned back, waiting for Retief's reaction. Unfortunately, Jorgensen's Worlds are technologically undeveloped areas. "I have here," he said solemnly, "information which will change that picture completely." Magnan spread his fingers, folded one down. "If it's trapped for destruction, I suppose—" "I've heard of these Jorgensen's Worlds," Retief said. Overall policy calls for a defense of these backwater worlds. Retief opened the envelope Magnan handed him and looked at the tickets inside. "You'll be traveling with Class X credentials," Magnan snapped. II Retief put down the heavy travel-battered suitcase and leaned on the counter, studying the schedules chalked on the board under the legend "ALDO CERISE—INTERPLANETARY." "For the two twenty-eight for Jorgensen's Worlds," Retief said. "But—" Retief picked up his suitcase and walked away toward the glare sign reading To Gates 16-30 . "Finders keepers."
 Tourists are no longer welcome and travel has been halted.
 It's difficult to locate and makes travel rather uncommon  Tourists are no longer welcome and travel has been halted.  It's existence is only known as top-secret so there is no information about it.  Ships are unable to land due to too many tourists