nebulae

    Article

    The plural form of the word nebula. Nebulae are interstellar clouds of gas and dust that exist outside the solar system. There are two kinds of nebulae: extragalactic nebulae, a huge collection of stars and dust or galaxies, and galactic nebulae, made of interstellar medium or a cloud of dust that exists between stars.

    Photo Credit

     
    "Orion's Nebula (M42), January 25, 2009" by astrorom is licensed under CC BY-NC-ND.

    References

     
    Encyclopædia Britannica Online
         N.d.   Nebula. http://www.britannica.com/EBchecked/topic/407602/nebula, accessed
             December 10, 2014.