Arecibo telescope (Picture I) https://pimeakronikka.blogspot.com/p/the-quicksilver-and-its-usage-in.html Kimmo Huosionmaa Only liquid metal in nature is Quicksilver, what is used in thermometers. But this element can be used in the optical telescopes. In this system, the Quicksilver would be the tip in the dish, what is rotating at very high speed, and this rotating makes the metal act like water and forming the parabolic mirror, what can use in the optical telescopes. The problem with this kind of mirrors is that they are suitable only in the zenith mirrors, what are looking straight upwards. The best example of zenith-telescopes is the largest single antenna radiotelescope in Arecibo, Puerto Rico. This zenith telescope has brought in the mind the thing, that Quicksilver is also metal, what conducts electricity. So this liquid metal can also be used for large radiotelescopes, where rotating dish would make the parabolic form for that system. Here I would return to write abo...