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1.b 2 a 3.c

Observing and interpreting a spectrum is one of the most important tools an astronomer has to learn about stars.

There are three types of spectra. Each one plays a key role in the interpretation of the elements, which make up stars.

The first one is a continuous spectrum. As viewed through a spectrometer, it looks like this:

Notice that this hot and high density gas produces ALL the colors of the rainbow. There are NO wavelengths missing. In other words, this object, a star, emits the entire electromagnetic spectrum.

Remember that not all wavelengths are emitted at the same energy (intensity) according to Planck's Law (referred to as a black-body curve in your book.)

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