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    PhET
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    In this online activity, learners make a whole rainbow by mixing red, green, and blue light. They can change the wavelength of a monochromatic beam or they can filter white light. They can also...

    free Ages 6 - adult 5 to 10 minutes
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    National Optical Astronomy Observatory
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    In this international citizen science activity, learners measure their night sky brightness and submit their observations into an online database. This popular program has generated 100,000...

    free Ages 4 - adult 10 to 30 minutes
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    NOAA
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    Learners complete a series of hands-on and investigative activities to explore cumulus clouds. Learners observe cumulus clouds outside, read a book about how cumulus clouds differ from other clouds...

    $5 - $10 per group Ages 4 - 11 30 to 45 minutes