Meet HELIX, the High-Altitude Balloon That May Solve a Deep Cosmic Mystery
Every now and then, tiny particles of antimatter strike Earth from cosmic parts unknown. A new balloon-borne experiment launching this spring may at last find their source
![Meet HELIX, the High-Altitude Balloon That May Solve a Deep Cosmic Mystery](https://static.scientificamerican.com/dam/m/7f7b984fcf1c2f71/original/high-altitude-balloon-1041-lead.jpg?w=1200)
Every now and then, tiny particles of antimatter strike Earth from cosmic parts unknown. A new balloon-borne experiment launching this spring may at last find their source
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