GMAT Reading Comprehension (RC) | While space looks empty, it is in fact filled with matter

While space looks empty, it is in fact filled with matter. In 1933, Swiss astrophysicist Fritz Zwicky coined the term “dark matter” to identify the substance that makes up an estimated 85% of all matter in the universe. Ever since, however, the search for the particles that compose dark matter has been ongoing with hypotheses and projections filling the minds of determined physicists in search of a breakthrough.

Among the most promising hypotheses is one that includes neutralinos, a proposed
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