For starters, it doesn't seem impossible to build it, on earth or in space. You don't need a continuous mirror of that size. I wonder if any of the LIGO techno

For starters, it doesn't seem impossible to build it, on earth or in space. You don't need a continuous mirror of that size. I wonder if any of the LIGO technology can be applied to optical telescopes? https://en.wikipedia.org/wiki/Aperture_synthesis https://en.wikipedia.org/wiki/Aperture_synthesis