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STAR NOTES A star is a sphere of hot gas that emits light and radiation We see different constellations throughout Stars the year because different portions of the universe are visible to us during that time ( the Earth revolves around the sun) We use light years to determine the distance to stars All energy from stars comes from thermonuclear reactions (fusion) in the core Fusion is 2 small atomic nuclei joining to form one atom Life of a star All stars are held together by gravity** The Hertzsprung – Russell diagram Our sun is an average,yellow,main sequence star • All the energy the sun provides to the Earth was previously contained in the atoms of the sun. • All stars radiate light, heat, and electromagnetic waves • The brightness of a star is determined by the size, distance, and temperature • The electromagnetic spectrum contains all the transverse waves in order of their wavelength and frequency: • Radio, infrared, visible, ultraviolet, x-rays, gamma rays