Astrophysics: Stars, Galaxies, and Cosmology Key Concepts Exam questions and answers
Astrophysics: Stars, Galaxies, and Cosmology Key Concepts Exam questions and answers apparent brightness - how bright an object appears in the sky, as contrasted with its actual luminosity brown dwarf - an object intermediate in size between a planet and a star; sometimes called a "failed star" color index - difference between the magnitudes of a star in two different spectral regions giant - a star of exaggerated size with a large, extended photosphere luminosity - the rate at which a star emits electromagnetic energy into space; the total power output of an objec
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astrophysics stars galaxies and cosmology key