XMM-Newton and Chandra data reveal Milky Way's outer spiral arms are 10% farther than previously thought

Summary

Using XMM-Newton and Chandra X-ray space telescopes, astronomers have detected light echoes from three bright explosions (supernovae) in the Milky Way's outer spiral arms. By measuring the time delays in these X-ray echoes, they calculated more precise distances to the outer arms, finding them to be up to 10% farther from the galactic center than previously estimated. This revises our understanding of the Milky Way's structure and scale.

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