Pierre Auger Observatory

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What Wikipedia says

The Pierre Auger Observatory is an international cosmic ray observatory in Argentina designed to detect ultra-high-energy cosmic rays: sub-atomic particles traveling nearly at the speed of light and each with energies beyond 1018 eV.

Excerpt from the Wikipedia article “Pierre Auger Observatory”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Lorenzo Caccianiga, CC BY-SA 3.0, via Wikimedia Commons.