NASA's Juno mission has made groundbreaking observations of particles traveling at nearly the speed of light in the vicinity of Jupiter, significantly advancing our understanding of cosmic rays. Cosmic rays, which are high-energy particles originating from sources like supernovas and solar eruptions, have puzzled astronomers for over a century. When solar cosmic rays reach Earth, they can disrupt satellite operations and power systems. Juno's measurements in Jupiter's foreshock region revealed that electrons there reached speeds exceeding those recorded near Earth. This acceleration is attributed to Jupiter's larger bow shock, which forms as its magnetic field interacts with solar particles. The research, published in the journal Nature, indicates that the acceleration mechanisms observed around Jupiter may also apply to cosmic rays from supernovas throughout the galaxy, suggesting a universal process for generating high-energy particles across the cosmos.