sentence: Evolutionary patterns are found that relate to the mass, age and composition of the star.
sentences_before: In a Hertzsprung-Russell diagram the absolute magnitude for a group of stars is plotted against the spectral classification of the stars.
sentences_after: In particular, during their hydrogen burning period, stars lie along a curve in the diagram called the main sequence.
concept_name: evolutionary pattern
headings: Cosmic distance ladder Galactic distance indicators Main sequence fitting
categories: Astronomical distances