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Dry Ice Comet
Source Institutions
In this activity, dry ice and other items are used to construct a demonstration model of a comet that illustrates the comet nucleus, coma, and tails.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-003-462.png?itok=qTR9s83z)
Human-powered Orrery
Source Institutions
In this space science activity, learners work together to create a human-powered orrery to model the movements of the four inner planets.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-004-408.png?itok=dd_A7Gmi)
Why Does the Moon Have Phases?
Source Institutions
In this activity, learners use a simple 3D model to discover why the Moon has phases.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-577.png?itok=ptETfKBd)
Modeling the Night Sky
Source Institutions
In this two-part activity, learners explore the Earth and Sun's positions in relation to the constellations of the ecliptic with a small model.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-571.jpg?itok=ChASMMeD)
Colors of Stars
Source Institutions
In this activity, learners observe colors in the flame of a burning candle to explore connections between matter, light, color and temperature -- basic concepts of matter and energy.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-866.jpg?itok=aeniFI_r)
The Thousand-Yard Model
Source Institutions
This is a classic exercise for visualizing the scale of the Solar System.