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Grade 5 D-2 Sci. Def
Chapter 2 The Sun and Other Stars
Term | Definition |
---|---|
photosphere | The visible surface of the sun |
corona | The sun's atmosphere |
sunspot | A dark spot on the photosphere of the sun |
solar flare | A brief burst of energy from the sun's photosphere |
solar wind | A fast-moving stream of particles thrown into space by solar flares |
magnitude | Brightness of stars |
main sequence | A band of stars that include most stars of average color |
universe | Everything that exists—planets |
galaxy | A group of stars |
light-year | The distance light travels in one Earth year; about 9.5 trillion km |