A Why Can't We Detect Cosmic Rays Beyond the GZK Limit?

Zuzana
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Hello,
I would like to ask, why there cannot be detected cosmic rays with energies higher than ~ 10^20 eV, i.e. beyond the GZK limit?

Thanks a lot in advance for the answer.
 
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What have you found out? For example, did you look on Wikipedia? What was hard to understand?
 
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