Scientists Crack 100-Year Mystery of Cosmic Rays with Universal Pattern Discovery
Researchers using the DAMPE space telescope uncovered a hidden rule governing ultra-powerful particles that travel across the galaxy, potentially solving one of physics' longest-standing puzzles.
Scientists studying the universe's most powerful particles have discovered a universal pattern that could finally explain where cosmic rays come from and how they behave across the galaxy. Using advanced observations from the DAMPE (Dark Matter Particle Explorer) space telescope, researchers found that cosmic ray particles ranging from tiny protons to heavy iron nuclei all begin fading away more sharply at exactly the same rigidity threshold, revealing what appears to be a fundamental rule governing their behavior throughout space.
Cosmic rays have puzzled scientists for more than 100 years since their discovery, carrying energies far exceeding anything produced by Earth's most powerful particle accelerators. These mysterious particles are believed to originate from some of the universe's most violent events, including supernova explosions, black hole jets, and rapidly spinning neutron stars called pulsars. Despite decades of research and technological advances, the mechanisms behind their creation and acceleration have remained largely unexplained.
The breakthrough came from analyzing highly precise data collected by DAMPE, a Chinese-led mission launched in December 2015 with significant contributions from the University of Geneva's Department of Nuclear and Particle Physics. Researchers examined the energy spectra of primary cosmic ray nuclei and discovered that every type of particle studied exhibits the same dramatic change in behavior beyond a rigidity of roughly 15 teraelectron-volts. Rigidity measures how strongly a particle's trajectory resists deflection by magnetic fields, making it a crucial parameter for understanding cosmic ray propagation through space.
Andrii Tykhonov, an associate professor at the University of Geneva and co-author of the study published in Nature, explained that cosmic rays span an enormous energy range from a few billion electron-volts to beyond 1,000 billion electron-volts. The newly discovered universal pattern, known as spectral softening, shows that the number of high-energy particles drops much more rapidly after reaching the critical threshold. This behavior appears consistently across all particle types, from lightweight hydrogen nuclei to heavy iron atoms.
The findings strongly support theories suggesting that cosmic ray acceleration and movement through the galaxy are controlled by rigidity rather than other particle properties. The research rules out competing explanations based on energy per nucleon with a confidence level reaching 99.999 percent. This discovery could revolutionize understanding of how cosmic rays are produced in stellar explosions and other cosmic phenomena, potentially leading to new insights about the violent processes that shape our galaxy and influence Earth's atmosphere.
