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Re:Physicists have filmed the oscillation of a time crystal by Confusion on Wednesday March 03, 2021 @01:34AM (#26325438)
Not necessarily. You can measure things in ways that add energy: e.g. radar waves contribute a tiny bit of energy to the things they bounce off. Yet they measure where objects are.

You can also measure some things in ways that add exactly 0 energy. If some quantum system absorbs exactly nothing of a certain wavelength, that tells you something about the system.

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