Description:
 

In this demonstration, the effect of stars appearing to twinkle is explored and explained.

 


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Description:

This is a demonstration that shows what retrograde motion looks like and describes the mechanism behind it.


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Description:

A look at the geometries that give rise to Moon phases.


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Read more: Phases of the Moon

Description:

    Sunspots appear as dark spots on the surface of the sun, even though they are at temperatures of thousands of kelvin. This demonstration shows this phenomenon in the classroom.

 


Description:

Three short ways to demonstrate how the space between objects - like galaxies - is slowly increasing due to the universe expanding. These demos were done under a black light, but it could be done just as easily without.

 


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