SHEDDING LIGHT ON DARK MATTER

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Scientists have found evidence that may help solve one of theenduring mysteries of astrophysics: the content of the so-called "dark matter" that fills much of the universe. Researchers at the Los Alamos National Laboratory in New Mexico think that the little-understood neutrinos, the most common form of matter in the universe, have mass after all and may make up a significant portion of that dark matter. If this finding is confirmed, saysTIME science writer J. Madeleine Nash, "it would be pretty stunning." Such proof would help scientists understand whether the universe will go on expanding indefinitely, will remain in a stable state, or begin to contract.