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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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    Astronomical Society of the Pacific
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    This fun, nighttime hands-on astronomy activity lets learners explore how long it takes for light from different objects in the universe to reach Earth. The activity shows participants the...

    1 cent - $1 per group Ages 8 - adult 1 to 2 hours
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    The Exploratorium
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    In this demonstration/activity, learners observe as a regular size marshmallow is blown through a tube made from a manila file folder. The result is spectacular, and the process provides a great...

    $1 - $5 per group Ages 8 - 18 10 to 30 minutes
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    American Museum of Natural History
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    Learners use simple materials to construct a model the Big Dipper. Learners hang the model from a doorway or ceiling and look up at it to see the constellation as seen from Earth. They can also...

    $1 - $5 per student Ages 8 - 18 30 to 45 minutes
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    The Exploratorium
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    In this math activity related to light, learners explore why a light, such as a candle or a streetlight, looks dimmer the farther away from it we get. The answer lies in the Inverse Square Law,...

    $5 - $10 per student Ages 11 - 18 10 to 30 minutes
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    COSI
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    In this physics activity (page 6 of the PDF), learners will build a class 1 lever and hypothesize and test the distances two objects need to be placed from the fulcrum in order to balance. They...

    1 cent - $1 per student Ages 14 - 18 10 to 30 minutes
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    NASA
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    In this activity, learners investigate parallax, a method used to measure distances to stars and planets in the solar system. Learners can see the parallax effect in action by holding their thumb...

    free Ages 6 - 18 Under 5 minutes
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    Astronomical Society of the Pacific
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    This fun hands-on astronomy activity lets learners explore models of the Milky Way and other galaxies to get a sense of relative distances to other galaxies. Part of the activity involves learners...

    1 cent - $1 per group Ages 8 - adult 45 to 60 minutes