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Light: Crash Course Astronomy #24

In order to understand how we study the universe, we need to talk a little bit about light. Light is a form of energy. Its wavelength tells us its energy and color. Spectroscopy allows us to analyze those colors and determine an object’s temperature, density, spin, motion, and chemical composition.

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Table of Contents
Light is a Form of Energy 0:39
Wavelength Tells Us Its Energy and Color 0:59
Spectroscopy 7:28

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Wavelengths [credit: Imagine the Universe! / NASA]
Observatories across spectrum [credit: Imagine the Universe! / NASA]
Red hot spiral hotplate [credit:]
The Crab Nebula [credit: NASA, ESA, J. Hester and A. Loll (Arizona State University)]
Building the Space Telescope Imaging Spectograph [credit: NASA]
VST images the Lagoon Nebula [credit: ESO/VPHAS+ team]
Jupiter [credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute]
Venus [credit: NASA – NSSDC Photo Gallery Venus]
Ring Around SN 1987a, image 1 [credit: Jason Pun (NOAO) and SINS Collaboration]
Ring Around SN 1987a, image 2 [credit: George Sonneborn (GSFC) and NASA/ESA]