Argus Array

The Argus Array is a Federation subspace telescope located near Cardassian space.

In 2367, contact with a Cytherian probe caused damaged to the Argus Array. The crew of the USS Enterprise (NCC-1701-D) were able to repair the array soon after. 

In several alternate realities experience by Worf in 2370, the Argus Array was sabotaged by the Cardassians to spy on nearby Federation outposts, was destroyed by the Cardassians in another reality and was destroyed by the Bajorans in another. 

In 2372, the Argus Array detected subspace distortion waves coming from the Geminus Gulf. The distortions were later determined to be originating from a Romulan cloaking field designed to hide a starbase.