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    NASA
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    This demonstration activity models how Venus appears from Earth. This activity will help learners see why Venus appears to us sometimes as the "morning star" and sometimes as the "...

    1 cent - $1 per group Ages 4 - 14 5 to 10 minutes
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    NASA
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    In this activity, learners explore the relative size of the Sun and Earth as well as the distance between them. Learners estimate the size of the Sun and Earth and then use scaled models to...

    1 cent - $1 per group Ages 6 - 18 5 to 10 minutes

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