Technology
The telescopes that spin liquid mercury
HERE’S THE INTERESTING PART
Grinding giant glass mirrors is expensive and tedious, so physicists found a terrifying shortcut. By pouring a massive vat of toxic liquid mercury and spinning it at a constant speed, centrifugal force naturally pushes the liquid into a flawless parabolic shape. It creates a perfect reflective surface for space viewing, provided nobody accidentally trips and spills it.
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