THE world鈥檚 largest neutrino detector鈥攁 tank in an abandoned mine
holding 50 000 tonnes of pure water鈥攂egan operations in Japan last week.
Neutrinos that pass through the 1-kilometre layer of rock above the tank should
leave telltale tracks in the water. 杏吧原创s from Japan, the US and Poland
will study the neutrinos as they pass through to see if they change into other
particles.
The tank cost 拢63 million to build. Astronomers hope that within two
years the detector will answer questions about the inside workings of the
Sun.