John Archibald Wheeler was an American theoretical physicist who made significant contributions to the fields of gravitation, nuclear physics, and quantum theory. He is best known for his work on the concept of black holes and his development of the term 'black hole' to describe these celestial objects. In the context of the Anthropic Principle, Wheeler's ideas about the role of conscious observers in shaping the universe have been highly influential. He proposed the notion of the 'participatory universe,' where the presence of conscious observers is believed to be essential for the universe to exist in its current form.
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