Astronomy
Cosmic Rays: High-Energy Particles from Beyond the Solar System
Quick fact
The most energetic cosmic rays carry more energy than a baseball pitched at 100 km/h, yet they are single subatomic particles—packing millions of times more energy than anything produced in human-built particle accelerators.
Why this is interesting
Every second, hundreds of invisible particles from deep space pass right through your body—and you don't feel a thing. Where do these mysterious cosmic bullets come from, and what can they tell us about the most violent events in the universe?