A 100 kilometer diameter radio telescope could cost a few drachmas to construct.
It's been a long time since I took an astronomy course but I can't see the practicality of building a telescope that size.
Does the Earth's atmosphere effect radio in the same way that visual images are distorted?
Or did I misunderstand the reference?
Hmmm... Gotta be careful here... I believe the atmosphere is transparent to most if not all radio wavelengths, ignoring the effects of lightning, etc. Anyone else know for sure?