Harvard Classification

In astronomy, stellar classification is the classification of stars based on their spectral characteristics. Light from the star is analyzed by splitting it with a prism or diffraction grating into a spectrum exhibiting the rainbow of colours interspersed with absorption lines. Each line indicates an ion of a certain chemical element, with the line strength indicating the abundance of that ion. The relative abundance of the different ions varies with the temperature of the photosphere. The spectral class of a star is a short code summarizing the ionization state, giving an objective measure of the photosphere's temperature and density.
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    … with nods for several Netflix original series, Amazon’s first appearance with Transparent, and two surprise nominations for the CW’s quirky Jane the Virgin. The sky above This week, searchers spent a good chunk of their time looking up. The weather was top of mind as the Pineapple Express—no, not the film—hit the San Francisco Bay Area, causing flooding…

    Emily Wood/ The Official Google Blogin Google- 17 readers -
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