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on Sept 15, 2021
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Lunar Crater Radio Telescope on the Far-Side of th...
You can do that on earth, too. See
https://en.wikipedia.org/wiki/NASA_Orbital_Debris_Observator...
,
https://en.wikipedia.org/wiki/Large_Zenith_Telescope
for (decommissioned) examples (both found via
https://en.wikipedia.org/wiki/Liquid-mirror_telescope
)
The idea apparently came from Isaac Newton.
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The idea apparently came from Isaac Newton.