|Federation Science Station Database - Argus Array|
|A huge subspace radio telescope located three light-years from Cardassian space.
The Argus Array stopped transmitting data in 2367, and the Enterprise-D personnel discovered that the array's fusion reactors had gone unstable and were threatening to overload. An alien probe, sent by the Cytherians, was later found to be responsible for the malfunctions.
TNG "The Nth Degree"
(In an alternate quantum reality visited by Worf during 2370, the Argus Array became the subject of an investigation by the Enterprise-D. The array had been tampered with, apparently by Cardassians, and reset to survey sensitive Starfleet installations and relay that data to a sector outside Federation space. In yet another quantum reality, the array was destroyed by Cardassians, and in a thrid, it was destroyed by Bajorans. In yet another, the array remained intact, but had ceased functioning because of a mechanical failure.)
One of the images shown on Geordi's screen was a re-use of the Regula I space station from Star Trek II, and another was the S.S. Birdseye from TNG "The Neutral Zone". One of the planet images was an alien city designed by Anthony Fredrickson, and the other was a painting of the Utopia Planitia Fleet Yards surface facilities by Rick Sternbach and Mike Okuda.
Star Trek Encyclopedia II