High-energy particles are subatomic particles that possess a significant amount of energy, often resulting from cosmic events or artificial accelerators. These particles can include protons, electrons, and heavier ions, and they travel at speeds close to the speed of light. Their high energy allows them to penetrate materials more effectively than lower-energy particles. These particles are of great interest in fields like astrophysics and particle physics. For example, cosmic rays are high-energy particles originating from outer space, while particle accelerators like the Large Hadron Collider can create high-energy conditions to study fundamental forces and particles.