Answer: Namibia
Notes: Scientists at the High Energy Stereoscopic System (HESS) observatory in Namibia detected cosmic rays with record energy levels of 40 teraelectronvolts. HESS is an array of Cherenkov Telescopes in Namibia's Khomas Highlands, operational since 2003. It observes gamma rays, the most energetic light, produced by violent cosmic events. Located in the southern hemisphere, it focuses on sources in the Milky Way and distant galaxies. HESS indirectly detects gamma rays via air molecule interactions as they cannot penetrate Earth's atmosphere. Its research includes dark matter and fundamental physics, involving 260 scientists from 40 institutions across 13 countries.
