Spectra are like the barcodes used at the supermarket checkout; each pattern can be scanned to provide information about the star. The main reason spectra of different stars are different is that the stars have different surface ______. While we know that each _ leaves a different pattern in the spectrum, mostly the stars have roughly similar _, with only a few exceptions. The most common element in all stars is _. Astronomers use the patterns in the spectra of stars to sort all stars into categories called _; the hottest stars are given the letter . Objects which are not hot enough for hydrogen fusion to take place in their cores are called _________.

Spectra are like the barcodes used at the supermarket checkout; each pattern can be scanned to provide information about the star. The main reason spectra of different stars are different is that the stars have different surface _temperatures_________.

While we know that each _element________ leaves a different pattern in the spectrum, mostly the stars have roughly similar _compositions__________, with only a few exceptions.

The most common element in all stars is ___Hydrogen__________. Astronomers use the patterns in the spectra of stars to sort all stars into categories called _Spectra class_________

the hottest stars are given the letter _O_. Objects which are not hot enough for hydrogen fusion to take place in their cores are called ___Brown Dwarfs.________.

In physics astronomy, spectral lines of a star are formed when the light from the inner parts of the star bombards the elements in its atmosphere.The hottest stars are given the letter O while the cooler stars are noted with M.

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