Liquid Mirror Telescope

The first time I heard that liquid mirrors worth studying was from a Nature’s News & Views article.
Rotating liquid that creates a parabolic surface enables human to
conceive about really big telescopes that have to be built on the moon.
The Nature article praised the use of ionic liquids (ILs)
— liquids that are hardly volatile — for liquid mirror support, because
in the moon the working environment is vacuum. And it is also cold
there, so the liquid mirror should also melt at as low a temperature as
possible.