Compact, reflective, easy-to-manufacture mirrors are a critical component for advancing astronomical technology in space. Mirrors are a key component in most telescopes, though they are notoriously ...
Dee may have bought the mirror in Bohemia (now part of the Czech Republic) in the 1580s. S. Campbell / Antiquity An obsidian “spirit mirror” used by John Dee, an advisor to England’s Elizabeth I, ...
Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. An obsidian ...
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