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Ryuto Fujii

First author, Nagoya University Graduate School of Science

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Japanese-U.S. team demonstrates X-ray telescope sharp enough for CubeSats, challenging billion-dollar observatory model

New Capabilities

Published first-author paper on electroformed X-ray optics

For a quarter century, one telescope has dominated X-ray astronomy: NASA's Chandra, a bus-sized, $1.65 billion observatory with mirrors 1.2 meters across. Now a team from Nagoya University and Japan's SPring-8 synchrotron has produced a single seamless nickel mirror just 60 millimeters wide that matches Chandra's core sharpness — resolving an object 3.5 millimeters wide from a kilometer away. The mirror flew on the FOXSI-4 sounding rocket in April 2024 and captured images of a solar flare.

Updated Yesterday