In astronomy and physical cosmology, the metallicity is the fraction of mass of a star or other kind of astronomical object that is not in hydrogen or helium.

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A supernova is an astronomical event that occurs during the last stellar evolutionary stages of a massive star’s life, whose dramatic and catastrophic destruction is marked by one final titanic explosion.

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The Hertzsprung-Russell diagram (HRD), abbreviated H-R diagram or HRD, is a scatter graph of stars showing the relationship between the stars’ absolute magnitudes or luminosities versus their spectral classifications or effective temperatures.

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The Milky Way is the galaxy that contains our Solar System. The Milky Way is a barred spiral galaxy that has a diameter usually considered to be about 100,000-120,000 light-years.

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The kelvin is a unit of measure for temperature based upon an absolute scale. It is one of the seven base units in the International System of Units (SI) and is assigned the unit symbol K.

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