> ## Content Index
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# What’s The Universe’s Strongest Particle Accelerator?
- URL: https://www.cascadepbs.org/show/pbs-space-time/episode/whats-the-universes-strongest-particle-accelerator-v5hzur/
- Published: 2024-05-31T15:30:29.000Z
- Updated: 2025-08-21T13:46:58.000Z
- Description: We only recently figured out where cosmic rays are coming from.
- Author: Cascade PBS Staff
- Tags: PBS Space Time, Season 10, Episode 11, #ZZZ_Episode_c1a3975d-721b-48e0-840a-0413cfd2250c, #episode, #ZZZ_Show_ae70f836-13b6-4c9d-b61f-99f7b8bc29eb, #v1.16

Cern's Large Hadron Collider routinely collides particles at energies equivalent to a fraction of a second after the Big Bang, but a particle with the energy of an LHC collision hits every square kilometer of the Earth every single second. And we only relatively recently figured out where these cosmic rays are coming from.