The Second Most Powerful Cosmic Ray in History Came from--Nowhere?
Amaterasu—the most powerful cosmic ray seen in three decades—seems to come from an empty point of the sky. New telescopes may solve the mystery of its origins
![The Second Most Powerful Cosmic Ray in History Came from--Nowhere?](https://static.scientificamerican.com/sciam/cache/file/3ACBFABE-BEA2-45A9-AD39136219A42B05_source.jpg?#)
Amaterasu—the most powerful cosmic ray seen in three decades—seems to come from an empty point of the sky. New telescopes may solve the mystery of its origins
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