Ultra-high-energy cosmic radiation as a research area investigates cosmic rays with energies typically above 10¹⁸ eV, focusing on their origins, acceleration mechanisms, propagation through intergalactic and galactic magnetic fields, and interactions with cosmic microwave background photons (e.g., Greisen–Zatsepin–Kuzmin suppression). The field integrates astroparticle physics, high-energy astrophysics, and cosmology, using extensive air-shower observatories, fluorescence telescopes, and surface detector arrays to measure energy spectra, arrival directions, and mass composition. Research addresses candidate sources such as active galactic nuclei or gamma-ray bursts, tests hadronic interaction models at energies beyond terrestrial accelerators, and constrains fundamental physics, including Lorentz invariance and particle cross-sections at extreme energies.
In the exotic world of particle physics, neutrinos may be the most mysterious members. They rarely interact with other matter, have almost no mass, and have no electrical charge. These characteristics make them extremely ...
Astronomy
Apr 24, 2026
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Spanish astronomers have conducted a near-infrared study of an ultra-high energy gamma-ray source designated LHAASO J2108+5157. The new study, published February 11 on the arXiv preprint server, tries to unravel the mysterious ...
The KM3NeT collaboration is a large research group involved in the operation of a neutrino telescope network in the deep Mediterranean Sea, with the aim of detecting high-energy neutrino events. These are rare and fleeting ...
Cosmic rays are extremely fast, charged particles that travel through space at nearly the speed of light. The Amaterasu particle was detected in 2021 by the Telescope Array experiment in the U.S. It is the second-highest-energy ...
Astronomy
Feb 5, 2026
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The last gasp of a primordial black hole may be the source of the highest-energy "ghost particle" detected to date, a new MIT study proposes.
Astronomy
Sep 18, 2025
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Neutrinos are subatomic particles with no charge and very little mass that are known to weakly interact with other matter in the universe. Due to their weak interactions with other particles, these particles are notoriously ...
NTNU researchers may have found the answer to one of the big, unanswered questions in physics. The universe is full of different types of radiation and particles that can be observed here on Earth. This includes photons across ...
Astronomy
May 22, 2025
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The use of artificial intelligence (AI) scares many people as neural networks, modeled after the human brain, are so complex that even experts do not understand them. However, the risk to society of applying opaque algorithms ...
Astronomy
Mar 17, 2025
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Ultrahigh Energy Cosmic Rays are the highest-energy particles in the universe, whose energies are more than a million times what can be achieved by humans. But while the existence of UHECRs has been known for 60 years, researchers ...
Astronomy
Mar 1, 2025
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Ultra-high energy cosmic rays, which emerge in extreme astrophysical environments—like the roiling environments near black holes and neutron stars—have far more energy than the energetic particles that emerge from our sun. ...
Astronomy
Dec 10, 2024
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