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| When you look at white light through a glass prism, you see a rainbow of colors called a spectrum. |
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| A hot, solid, object, such as the glowing wire inside a light bulb, gives off continuous spectrum. |
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Every element has a unique set of bright emission lines that act like a fingerprint for that element. |
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| The spectrum of a star is called an absorption spectrum. |
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| The brightest star in the sky, Sirius, has a magnitude of -1.4. |
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| Astronomers call the brightest stars in the sky first- magnitude stars. |
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| Astronomers call the dimmest stars sixth-magnitude stars. |
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The brightness of a star is called apparent magnitude. |
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| Absolute magnitude is a measure of how bright a star would be if the star were 32.6 light-years from Earth. |
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| A light-year is the distance that light travels in one year. |
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| The apparent shift in position of a star is called parallax. |
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