Proof of full COVID-19 vaccination is now required for all visitors ages
12+. Plan your visit
Look down into the chamber and you’ll see an ongoing cascade of thin white trails appearing and disappearing. These are cosmic ray tracks, created by high-energy subatomic particles from space.
Where: Crossroads: Getting Started
Like comets, these chunks of dry ice slowly disintegrate as they move, leaving a visible trail of condensed water vapor.
(Embarcadero at Green Street)
San Francisco, CA 94111
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