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    NASA
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    In this activity, learners discover that one way to cool an object in the presence of a heat source is to increase the distance from it or change the angle at which it is faced. Learners perform an...

    1 cent - $1 per group Ages 8 - 14 1 to 2 hours
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    National Optical Astronomy Observatory
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    This is a classic exercise for visualizing the scale of the Solar System. Both the relative size and spacing of the planets are demonstrated in this outdoor exercise, using a mere peppercorn to...

    1 cent - $1 per group Ages 6 - adult 45 to 60 minutes

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