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American Focus > Blog > Tech and Science > The Universe’s Most Powerful Cosmic Rays May Finally Be Explained : ScienceAlert
Tech and Science

The Universe’s Most Powerful Cosmic Rays May Finally Be Explained : ScienceAlert

Last updated: May 31, 2025 6:45 am
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The Universe’s Most Powerful Cosmic Rays May Finally Be Explained : ScienceAlert
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Unlocking the Secrets of Cosmic Ray Acceleration in Supernovae

Exploring the depths of our galaxy reveals engines capable of propelling atomic particles at speeds nearing that of light. The origins of these highly energetic cosmic projectiles have long puzzled researchers, with doubts cast on the traditional theory linking supernovae to the most powerful cosmic rays.

A recent study by an international team of physicists, through numerical simulations, may offer a lifeline to the supernova theory of cosmic ray emissions, suggesting that collapsing stars could indeed serve as extreme accelerators for these particles.

For over a century, scientists have been on a quest to identify the sources of the constant stream of atomic nuclei and occasional electrons bombarding Earth from space. The complex interplay of magnetic fields in the galaxy makes tracking the trajectory of cosmic rays akin to searching for a needle in a haystack.

One prime candidate for studying high-energy particle acceleration is Tycho’s star, a historic supernova located just a few thousand light years away. The explosive demise of this star in 1572 generated immense magnetic fields, raising the possibility of it being a cosmic ray accelerator.

tycho star
Remnants of the Tycho supernova. (X-ray: NASA/CXC/RIKEN & GSFC/T. Sato et al; Optical: DSS)

Recent research analyzing the magnetic fields associated with Tycho’s supernova revealed that their ability to accelerate cosmic rays may be lower than previously thought. While this doesn’t discredit the supernova origin of cosmic rays, it does shed light on the limitations of such mechanisms.

Astrophysicists propose the concept of PeVatrons – hypothetical cosmic engines capable of producing particles with energies a thousand times greater than current human technology. They suggest that dying stars, such as supernovae, could act as these enigmatic PeVatrons.

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The key lies in the timing of the supernova event, where a dense shell of material surrounding the star can interact with the shock wave from the explosion to create the turbulent conditions necessary for particle acceleration to PeV levels.

It is speculated that only young supernova remnants in dense environments may meet the criteria for accelerating particles to PeV energies, highlighting the complexity of cosmic ray acceleration processes.

With ongoing advancements in astrophysical research, the potential discovery of a nearby dying star could provide crucial insights into the mysteries of PeVatrons and the extreme particle acceleration mechanisms in the Universe.

This groundbreaking research is set to be published in Astronomy & Astrophysics, offering a glimpse into the fascinating world of cosmic ray acceleration within supernovae.

TAGGED:CosmicExplainedFinallypowerfulRaysScienceAlertUniverses
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