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    The University of Texas McDonald Observatory
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    In this activity, learners explore the relative sizes and distances of objects in the solar system. Without being informed of the expected product, learners will make a Play-doh model of the Earth...

    $1 - $5 per group Ages 8 - 18 30 to 45 minutes
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    Smithsonian Center for Education and Museum Studies
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    In this online interactive challenge, learners choose items to represent the Earth or solar system, then determine other items to represent the Moon, or Milky Way based on their relative size. The...

    free Ages 8 - 18 10 to 30 minutes
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    Lunar and Planetary Institute
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    In this activity, learners measure the diameter of their water balloons, model an impact, measure the diameter of the “crater” area, and determine the ratio of impactor to crater. This activity is...

    $1 - $5 per group Ages 8 - 14 10 to 30 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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    NOAA
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    In this activity, learners estimate how much water they think can be found in various locations on the Earth in all its states (solid, liquid, and gas) to discover the different water ratios in the...

    free Ages 6 - 14 10 to 30 minutes
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    American Museum of Natural History
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    In this activity, learners interpret three trackways and use measurements and a formula to infer the relative speed of dinosaurs. A portion of the activity details how students can create their own...

    free Ages 11 - 14 45 to 60 minutes
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    NASA
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    In this activity, learners build a 1:140 "scale model" of NASA's X-33 Reusable Launch Vehicle (RLV) Technology Demonstrator, and investigate how the model dimensions compare to the...

    1 cent - $1 per group Ages 8 - 14 1 to 2 hours
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    The Exploratorium
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    In this activity, learners build a tool called an inclinometer that can find the height of any distant object, from a tree to the North Star. Measure the angle of an object with the inclinometer,...

    $1 - $5 per student Ages 8 - 18 10 to 30 minutes
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    The Exploratorium
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    In this activity, learners use their hands as tools for indirect measurement. Learners explore how to use ratios to calculate the approximate height of something that can't be measured...

    free Ages 11 - 14 10 to 30 minutes