Masks are required for all visitors 2+. Vaccines recommended. 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.
Where: Fisher Bay Observatory Gallery 6, Mezzanine
(Embarcadero at Green Street)
San Francisco, CA 94111
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