A not-all-together sane way of showing a class how retrograde motion works!
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Here's how to show your students why stars twinkle in the night sky!
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Sunspots are "dark" spots on the surface of the sun.
Here's how to show students why they appear dark.
This demonstration shows how atmospheric scattering filters
the colour of the sun during a sunset.
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Read more: Why Are Sunsets Red?
A podcast that reviews the
Voyager Golden Record!
