If we talk radio telescopes instead of visible/infrared light telescopes, we likeky already have such big radio telescopes in orbit now, they are just pointing

If we talk radio telescopes instead of visible/infrared light telescopes, we likeky already have such big radio telescopes in orbit now, they are just pointing the wrong way (downwards): https://en.m.wikipedia.org/wiki/Orion_(satellite) https://en.m.wikipedia.org/wiki/Orion_(satellite) It is estimated the highly classified Orion signal inteligence satellites currently in geostationary orbit have radio reflecting dishes of more than 100 m in diameter.