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Classification of Stars

There are billions and billions of stars in our universe, we can't even count them. Classifying stars is a really helpful when identifying stars.

Spectral Letters

Spectral letters identify the tempreature of stars. M being the coolest stars and O being the hottest stars. Our sun's tempreatue is 10,000 degrees farenheit. Which means our star is a type G star. Below is a table for the spectral letters.
Image result for spectral letter table

Absolute and Apparent Magnitude

Another way to classify stars is through it's brightness. Absolute magnitude is the brightness of a star the lower the number the brighter the star is. Although the sun might look very bright it is only because we're so close to it. The sun's magnitude is 5. Apparent magnitude on the other hand is how bright it is in the sky.

H-R Diagram

The Hertzsprung-Russel Diagram or H-R diagram is a graph of both the spectral letters and absolute magnitude. below is an H-R Diagram
Source:Wikipedia

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