interferometer network using up to 7 radio telescopes.
Without any stars to give light, it could only be found using radio telescopes.
As befits such a gargantuan structure, one of the largest steerable radio telescopes in the world, its archive is vast.
The higher resolution of large radio telescopes can be used to probe the structure of individual molecular clouds.
space telescopeace radio telescope, HALCA, works with radio telescopes on the ground to form an interferometer twice as big as Earth.