Learn with us online while the Exploratorium is temporarily closed. You can help us reopen—donate today.
Turn an old CD into a spectroscope to analyze light.
So close, yet so far away.
Why is the sky blue? That's a sticky question.
Prove to yourself that Galileo was right.
Discover why the sky is blue and the sunset is red.
Watch Reggie Watts improvise a song about visiting Mars (or not).
What time is it on Mars?
How do you chase a comet—and how do you stop?
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San Francisco, CA 94111
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