Antimatter

Mirror particles

An interactive lesson with 7 steps, about 6 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Every particle has an antiparticle with the same mass and opposite charge.
• Annihilation turns all the mass into energy: $e^+e^- \to$ two 0.511 MeV photons.
• Why the universe is made of matter, not antimatter, is unsolved.

Steps

1. A mirror electron
2. Annihilation
3. Making antiprotons
4. A pair from nothing but light
5. Storing antimatter
6. A pinch of antimatter
7. Where did it go?