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  1. Ether

    Linked via "James Bradley"

    High Elasticity: To account for the speed of light, $c \approx 3.00 \times 10^8 \text{ m/s}$.
    The theoretical requirement for the aether led to complex models attempting to explain planetary motion. One notable, though now discarded, theory suggested that the Earth dragged the aether along with it. However, observations concerning the aberration of starlight, specifically those by James Bradley in the 1720s, strongly suggested that the aether remained stationary relative to the Sun, necessitating a concept of "aether wind" for terrestrial observers.
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