"If Newton had completed his gravitational observations and Kepler had been as curious about unmentioned vacuous focus as he was regarding the focus he did mention, science would now understand what this newly discovered negative "hole which acts like a proton" really is and I would not be in the position of being disliked by my scientific friends for playing the part of Copernicus to their Ptolemy." [Russell to NYT - 1930 November 2]

See Also

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Cathode
Figure 3.6.1 - Tornadoes also have a Down Draft caused by its vacuous center
Focus
Hole
Space
vacuous focus
vacuous force
Vacuum