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.


How do galaxies form?

Galaxies got their start nearly 14 billion years ago, with one unimaginably hot, dense and tiny pinpoint. How did we arrive at the universe's sprawling state of galactic affairs today?

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  • Achernar

    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. See more »

  • Algol

    Algol, a variable star in the constellation Perseus. (A variable star is one that changes in brightness.) Algol, which was observed by the ancient Greeks and named by the Arabs, is now known to be a complex system of at least four stars revolving around one another. See more »

  • Alpha Centauri
    Alpha Centauri

    Alpha Centauri, a system of three stars, one of whose membersProxima Centauriis the star nearest the sun. See more »

  • Altair

    Altair, the brightest star in the constellation Aquila. It is the 12th brightest star in the sky, with an apparent magnitude of 0.77. See more »

  • Antares

    Antares, the brightest star in the constellation Scorpius. The star has a red color like that of the planet Mars. See more »

  • Arcturus,

    Arcturus, the brightest star in the constellation Botes and one of the brightest stars in the night sky. See more »

  • Beta Centauri
    Beta Centauri

    Beta Centauri, or Hadar, one of the brightest stars in the night sky. It is the second brightest star (after Alpha Centauri) in Centaurus, a southern constellation. See more »

  • Betelgeuse

    Betelgeuse, a bright reddish star in the constellation Orion. It is about 495 light-years from the earth, though some measurements put it at about 640 light-years away. See more »

  • Canopus

    Canopus, the second brightest star in the night sky. (Sirius is the brightest.) Canopus is in the constellation Carina. See more »

  • 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 »

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