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This quick demonstration (on page 11 of PDF) allows learners to understand why scientists think water ice could remain frozen in always-dark craters at the poles of the Moon.

$1 - $5 per group Ages 6 - adult 5 to 10 minutes
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In this space science activity, learners explore transits and the conditions when a transit may be seen.

$1 - $5 per group Ages 11 - 18 45 to 60 minutes