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Spectral lines are useful in classifying stars because they help in the measure of surface temperatures.

The experts in astronomy use the patterns that they have seen in stellar spectra to arrange stars into different special classes.

The temperature of a star is helpful given that it shows the absorption lines that are in the spectrum of the star.

If the width of the stars are bigger then it is known that the diameter of the star is smaller.

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Answer:

2022 Star Comparisons Quiz

Explanation:

1. They show the composition of a star.

2. Plasma

3. The Hertzsprung-Russell diagram plots stars according to their luminosity and temperature, which is also associated with spectral class.

4. B

5. Main sequence

6. Radio waves and ultraviolet light

7. Carbon

8. Stellar nebula

9. Emission and absorption of light ; Interaction of light and atoms

10. Increases ; Increases

11. Nebula

(100%)

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