Big Idea: The Earth is a planet orbiting the Sun - one of many stars
in our galaxy, which is one of many galaxies in the Universe. More info...
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Demonstration: an experiment carried out by Eratosthenes over 2000 years ago.
This demonstration is an easy way to show how gas molecules in the atmosphere scatter light to cause the sky to appear blue.
Recognising and celebrating outstanding contributions to the field of physics education.