Still, physicists continue the search,
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, largely because they have a second motivation for believing that dark matter is made of a new kind of particle—a theoretical concept known as supersymmetry.
Supersymmetry appeals to physicists because it hints at ways to solve unsolved problems,
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, such as incorporating gravity into the theory explaining other forces. It originated in physicists’ efforts to understand symmetries connecting force and matter,
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, just as Einstein had exploited symmetries of space and time to develop his theory of relativity. Supersymmetry’s equations imply the existence of “superpartner” particles heavier than particles now known: a force particle partner for every known matter particle,
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, and a matter particle partner for every known force particle. A massive superpartner should have precisely the properties needed to account for the dark matter in space; it would interact only weakly with ordinary matter,
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, inspiring the nickname of WIMP (weakly interacting massive particle).
To many physicists, this confluence of motivations seemed sufficient justification to invoke Gibbs’ Rule No. 39 (for those who watch NCIS on TV): There is no such thing as a coincidence. It was called the “WIMP miracle.” Independently of any theoretical forecasts,
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, astronomers had observed clear signs of a mysterious source of gravity, most likely particles unknown on Earth. Independently of gravitational anomalies in space,
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, theorists had forecast exotic new massive particles permeating the cosmos. One reinforced the other,
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, just as centuries ago Isaac Newton’s law of gravity gained credibility because it explained both the orbits of the planets in space and falling apples on Earth.

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