"Scientists have made their most accurate measurement yet of the mass of a mysterious neutrino particle.
Neutrinos are sometimes known as 'ghost particles' because they interact so weakly with other forms of matter.
Previous experiments had shown that neutrinos have a mass, but it was so tiny that it was very hard to measure.
Using data from the largest ever survey of galaxies, researchers put the mass of a neutrino at no greater than 0.28 electron volts.
This is less than a billionth of the mass of a single hydrogen atom, the scientists say.
Their nickname is fitting: a neutrino is capable of passing through a light-year (about six trillion miles) of lead without hitting a single atom."
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