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Scientists at Tokyo University have drawn up plans for a million-tonne water
tank to see if protons decay over time. If they do, it would show that the
Universe must have a finite lifetime. Many physicists believe that protons have
a half-life some 20 times the age of the Universe. The proposed 拢225
million device鈥攁 cubic tank 100 metres across lined with light
detectors鈥攚ould pick up faint flashes as protons in the water decay.
Dubbed Hyper-Kamiokande, it would be 20 times the size of Japan鈥檚
Super-Kamiokande detector, which in 1998 showed that neutrinos have mass.