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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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    Astronomical Society of the Pacific
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    In this activity (on page 5 of PDF), learners use dry ice and household materials to make scientifically accurate models of comets. Learners will investigate the ingredients in comets and how...

    $5 - $10 per group Ages 6 - adult 10 to 30 minutes
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    NASA
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    Use this model to demonstrate the goal of NASA's Kepler Mission: to find extrasolar planets through the transit method. The model uses legos to represent the planet system, a light to...

    Over $20 per group Ages 11 - 18 10 to 30 minutes
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    Astronomical Society of the Pacific
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    In this activity, learners use a simple 3D model to discover why the Moon has phases. This activity is a very rewarding "ah-ha!" moment for learners since it helps to correct one of the...

    $5 - $10 per group Ages 6 - adult 10 to 30 minutes
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    TERC
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    In this activity, learners create models of erosion and floods and learn to recognize both in their environment. Using sand, wax paper, and water, learners observe the processes of erosion and...

    $1 - $5 per group Ages 8 - 18 45 to 60 minutes
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    The Exploratorium
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    In this geology activity learners build a "squeeze box," which allows them to compress layers of sediment. This is a great way to investigate folding and faulting in the Earth. The...

    $10 - $20 per group Ages 8 - 18 5 to 10 minutes
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    TERC
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    Using recycled materials, learners will design a transportation vehicle to carry an egg in an egg toss (a rudimentary model of a shock absorbent transport vessel). Learners will consider how their...

    $1 - $5 per group Ages 8 - adult 1 to 2 hours
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    The Exploratorium
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    In this geology activity, learners create a model using a mixture of salt and sand inside a CD case. When the case is tilted or inverted, the mixture dramatically sorts into a layered pattern. With...

    $5 - $10 per group Ages 11 - 18 1 to 2 hours
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    Astronomical Society of the Pacific
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    This fun and simple hands-on astronomy activity lets learners build a scale model of the universe with little more than adding machine tape. Learners are often surprised to find how empty the outer...

    1 cent - $1 per student Ages 6 - adult 45 to 60 minutes
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    Centers for Ocean Sciences Education Excellence
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    In this activity, learners are introduced to robotic submarines called gliders. Learners make “gliders” from plastic syringes and compare these to Cartesian bottles and plastic bubbles. Learners...

    $10 - $20 per group Ages 11 - 18 45 to 60 minutes