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.
Description:
Eclipses occur as a result of the geometry between the Earth, Moon, and Sun.
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Read more: Why Do Eclipses Happen?
A podcast that reviews the
Voyager Golden Record!
