Stellar Classification
Astronomers began to categorise stars, based on their mass and temperature, hundreds of years ago. As scientists have learned more about stars, this classification scheme has had to evolve.
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![An image showing seven spheres of increasing size. These are labelled, from left to right, "M", "K", "G", "F", "A", "B", and "O". "M" is red in colour. "K" is orange. "G" is yellow. "F" is yellow-white. "A" is white. "B" is white with hints of blue. "O" is white in the middle that fades to blue around the edges.](/sites/default/files/styles/things_to_do_photovidppt/public/Morgan-Keenan_spectral_classification.svg_.png?itok=X78pZ5Wi)
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