What powerful astronomical events are thought to accelerate Galactic Cosmic Rays (GCRs)?

Answer

Supernova explosions in distant parts of the Milky Way

Galactic Cosmic Rays, those originating outside our solar system, are thought to achieve their extreme energies through acceleration provided by massive events like supernova explosions occurring in faraway regions of the Milky Way galaxy.

What powerful astronomical events are thought to accelerate Galactic Cosmic Rays (GCRs)?
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