Scientists Uncover Universal Pattern in Cosmic Rays After Century-Long Mystery
Researchers using the DAMPE space telescope discovered that cosmic ray particles all fade away at the same point, revealing a hidden rule governing their behavior.
Scientists studying the universe's most powerful particles have finally uncovered a universal pattern that could help explain where cosmic rays originate, solving a mystery that has persisted for more than 100 years. Using data from the DAMPE (Dark Matter Particle Explorer) space telescope, researchers discovered that cosmic ray particles ranging from tiny protons to heavy iron nuclei all begin fading away more sharply at the exact same point, suggesting a fundamental rule governing their behavior across the galaxy.
Cosmic rays are among the highest energy particles ever observed in nature, carrying far more energy than particles produced by even the most advanced accelerators on Earth. Scientists believe these mysterious particles are created by some of the universe's most violent events, including supernova explosions, jets from black holes, and pulsars. Despite decades of intensive research, many questions about their origins and acceleration mechanisms have remained unanswered.
The breakthrough came from analyzing highly precise data collected by DAMPE, which was launched in December 2015 with major contributions from the University of Geneva's astrophysics group. Researchers discovered that for every type of cosmic ray nucleus studied, the number of particles begins dropping much faster after reaching a rigidity of roughly 15 teraelectron-volts. This phenomenon, known as "spectral softening," appears consistently across all particle types.
"Cosmic rays are primarily composed of protons, but also of helium, carbon, oxygen, and iron nuclei," explains Andrii Tykhonov, associate professor at the University of Geneva and co-author of the study published in Nature. "These particles are categorized according to their energy: low, up to a few billion electron-volts; intermediate, from a few billion to several hundred billion electron-volts; and high, from 1,000 billion electron-volts and beyond."
The discovery strongly supports theories suggesting that cosmic ray acceleration and movement through space are controlled by rigidity rather than energy per nucleon. The confidence level against alternative energy-based models reaches 99.999%, providing compelling evidence for this rigidity-based framework. This finding could revolutionize our understanding of how these cosmic messengers travel through the galaxy and help scientists identify their mysterious sources.
