gamma rays

Physicists have outlined an explanation for how a photon with an energy of 300 teraelectronvolts — among the most energetic gamma rays ever detected — could have travelled to Earth. The finding matters because such high-energy photons should in theory be absorbed or degraded over cosmic distances, so a viable propagation mechanism challenges existing models of intergalactic magnetic fields and fundamental physics.

A rigorous re-examination of cosmic gamma-ray observations has found no evidence that Lorentz invariance breaks down at high energies. Researchers applying unified statistical methods confirmed that the speed of light remains constant regardless of photon energy or direction, reinforcing Einstein's relativity and placing tighter limits on quantum-gravity models that predict energy-dependent light speeds.

New research using cosmic gamma rays is probing whether the speed of light is truly constant, a cornerstone of Einstein's relativity. By studying high-energy photons that travelled vast cosmic distances, physicists are searching for tiny deviations that could point to quantum gravity effects and challenge the limits of Einstein's theory.

NASA says a recent attempt to recover the Swift gamma-ray observatory, despite ending in failure, delivered valuable engineering lessons and unexpected scientific returns. The agency is framing the effort as a success for what it learned about servicing aging spacecraft, and Ars Technica reports the story is drawing attention among space enthusiasts discussing the mission's outcome.

The question of whether hypernovas are real is circulating in science coverage. Hypernovas are extremely energetic supernova explosions, typically linked to the collapse of massive stars, and astronomers widely accept them as real events observed through gamma-ray bursts and bright stellar explosions. The current discussion appears to reflect general public interest in confirming the science behind these cosmic phenomena rather than a specific new discovery.

Researchers have offered an explanation for how a photon with an energy of 300 teraelectronvolts, one of the highest-energy photons ever detected, could have travelled to Earth. Such extreme gamma rays are expected to be absorbed or degraded over interstellar distances, so the finding has drawn attention from physicists discussing the mechanisms that could allow it to survive the journey and what it reveals about cosmic accelerators.