Stars are celestial bodies made up of hot gases. Stars radiate energy that comes form thermonuclear reactions. In this section you will learn all about stars and their importance in the universe.


Achernar, a blue-white star in the constellation Eridanus. Achernar has an apparent magnitude of 0.5, making it one of the brightest stars in the nighttime sky.

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  • Castor and Pollux

    Castor and Pollux

    Castor and Pollux, in Greek and Roman legend, sons of the Spartan queen Leda. One legend says they were twins, and that Zeus was their father. See more »

  • Mira


    Mira, a reddish variable star of Cetus, the Whale, a constellation on the celestial equator. See more »

  • North Star

    North Star

    North Star, or Pole Star, a bright star near the north celestial pole (the point in the sky toward which the northern end of the earth's axis points). See more »

  • Procyon


    Procyon, the brightest star in the constellation Canis Minor (Little Dog) and one of the brightest stars in the night sky. See more »

  • Regulus


    Regulus, the brightest star in the constellation Leo. It is also called Alpha Leonis and Cor Leonis. See more »

  • Rigel


    Rigel, or Beta Orionis, a bright star in the southwest corner of the constellation Orion. See more »

  • Sirius


    Sirius, the brightest star in the night sky. It is called the Dog Star, being the chief star of the constellation Canis Major (great dog). See more »

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