What made the discovery of O-My God Particles a shock to astrophysicists?

its structure
its high energy
its speed
all the above
On the night of October 15, 1991, the “Oh-My-God” particle streaked across the Utah sky. A cosmic ray from space, it possessed 320 exa-electron volts (EeV) of energy, millions of times more than particles attain at the Large Hadron Collider, the most powerful accelerator ever built by humans
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its high energy
its speed
all the above
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