Physics

A partial solar eclipse, in which part of the sun’s disk is obscured by the moon passing between the star and Earth, was observed across Japan on Sunday morning.

Computers dominate modern society, including smartphones, personal computers and control devices for machines, but they have an unexpected natural enemy: cosmic rays, high-speed particles raining down from outer space to Earth. Observers say cosmic rays can cause errors in computers, and various studies are under way at universities and major electronics manufacturers to address the issue.

A jigsaw puzzle featuring the Super-Kamiokande neutrino detector is gaining popularity mainly because it’s so difficult to finish.

Twenty-five years after particle physicists began studying prospects for a linear collider, Japan is poised to decide whether to pay for half of the $7 billion project and build the 20-kilometer-long superconducting tunnel in mountains northeast of Tokyo.

Japan's Toshiba and IHI are dissolving a joint venture that manufactures nuclear power plant equipment, scaling back operations in a field battered by global trends toward renewable energy.

Hitachi and General Electric Co. will jointly develop a new type of nuclear power plant with small modular reactors, sources said Monday.The two companies, longtime partners in the nuclear business, aim to commercialize the reactors, which they hope will be cheaper to produce and safer to run, by the 2030s, the sources said.

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