Arimatsu, in central Japan, is the town that tie-dye built. Along its historic main street, fabric merchant houses have stood for centuries. When shopkeepers hang out their shingles here, the signs ...

In August, stargazers in Japan recorded a bright flash on the giant gas planet. Scientists want to use data like this to study our solar system’s birth. By Katrina Miller Ko Arimatsu, an astronomer at ...

Ko Arimatsu, an astronomer at Kyoto University in Japan, received an intriguing email a couple of weeks ago: An amateur astronomer in his country had spotted a bright flash in Jupiter’s atmosphere.