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What is a mysterium?

What is a mysterium? Here are some definitions.

Noun
  1. (chemistry) Any of various unknown elements thought to make up existing forms of matter, or a substance seen as an elemental or pure form of something else.
  2. (astronomy) The hypothetical source of a galactic radio emission at 1665 megahertz (later identified as due to hydroxyl radicals in interstellar space).
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