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Published online 11 April 2002 | Nature | doi:10.1038/news020408-9
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Neutrino weighed up
Astronomers use galaxies to reckon a subatomic particle's mass.
By mapping hundreds of thousands of galaxies, astronomers have estimated the mass of the neutrino. They have also calculated the contribution that this mysterious subatomic particle makes to the total mass of the Universe.
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