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Crash Course Astronomy
Dark Energy, Cosmology part 2: Crash Course Astronomy #43
Most of the universe is made up of a mysterious entity that pervades space: dark energy.
Light: Crash Course Astronomy #24
Welcome to school without the classroom! Join host Phil Plait and discover everything there is to know about the cosmos.
Light: Crash Course Astronomy #24
Season 1 Episode 24 | 10m 33s
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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