What's is the edge different between a mirror and a liquid mirror? Are their quality of reflecting light also differ too? say compare to our commonly use mirror in our scope with a revolutionary mirror made of a slowly spinning dish of mercury.
Is liquid mirrors still in vogue? It used to be a relatively cheap and easy way of increasing the primary mirror size, and also to vary the focal length of the primary without changing mirrors by altering the rotation rate. Disadvantage is that mercury vapors have to be controlled. Now with adaptive optics, I'm not sure it is possible to apply that to liquid mirrors?
[80% Steve, 20% Alfred] ------- Probability of Clear Skies = (Age of newest equipment in days) / [(Number of observers) * (Total Aperture of all telescopes present in mm)]
