We have built telescopes in our backyards, and high upon remote mountains, and even launched telescopes into space.
In this new paper, the authors summarize several known ideas and also introduce a new concept they call a hypertelescope.
Then there is the Lunar Optical UV Explorer , which focuses on bright ultraviolet objects. There are even proposals for aThe problem with all of these proposals is that they will require construction at a technical level that would be a challenge even on Earth. The idea of building array observatories and the like on the Moon is a lofty goal, but it is currently far beyond our technical abilities.
A hypertelescope could use a mirror array as the primary mirror arranged along the terrain of a crater. The detector cluster of the telescope could then be suspended by a cable, similar to the way the detectors of Arecibo Observatory were suspended above the mesh dish. A variant of this idea would be to place mirrors on one side of a crater, and the instrumentation on the other. This would allow for a very large focal length, the the observational range such such a telescope would be limited.
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