Unraveling the mystery of the 2021 cosmic ray "Amaterasu"
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November 24
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Described in a recently published article in the journal Science, the researchers have named the mysterious particles constituting this cosmic ray event "Amaterasu," after the mythical Sun Goddess who, according to legend, played a role in the creation of Japan.
"When we first detected this ultra-high-energy cosmic ray (UHECR), I was sure there must be a mistake because it showed energy levels unprecedented in the last three decades," said Professor Toshihiro Fujii, the lead author.
The researchers are uncertain about the origin of this cosmic ray because its trajectory appears to point toward





What is the energy level of the cosmic ray discovered in 2021?
320 EeV
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244 EeV
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199 EeV
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What did researchers name the mysterious particles constituting the cosmic ray event?
Why were researchers initially skeptical about the detection of the ultra-high-energy cosmic ray?
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