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Light: Wave-particle duality

Light: Wave-particle duality Creative commons image Credit: By Douglas Hofstadter [CC-BY-SA-3.0], via Wikimedia Commons
Introductory level Duration 10 mins Updated 11 Sep 2013
One of the most confusing concepts in physics, wave-particle duality is unlike anything we see in the ordinary world.

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Telescopes and spectrographs

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Telescopes and spectrographs Copyrighted image Credit: Used with permission
Intermediate level Duration 10 hours Updated 15 Oct 2012
This unit looks at how telescopes and spectrographs are designed to improve our ability to observe the universe. You will examine how different...