ASTRONOMY TERMS

Astronomy terms are used to describe the various phenomena in space. In this section you can learn what every astronomy term means and how it helps us to better understand the cosmos.
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Unidentified Flying Object

Unidentified Flying Object, or UFO, an object or light that cannot be readily explained as being man-made or of natural origin.

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  • Aberration of Light

    Aberration of Light

    Aberration of Light, a phenomenon in which a star or other celestial body, as viewed from the earth, appears to be slightly displaced from its true position. See more »

  • Albedo

    Albedo

    Albedo, in astronomy, the reflecting power of a celestial body that is not self-luminous. See more »

  • Andromeda Galaxy

    Andromeda Galaxy

    Andromeda Galaxy, a spiral galaxy that is larger than the Milky Way (the galaxy to which Earth belongs) but similar to it in structure, and the closest to ours. See more »

  • Astrogeology

    Astrogeology

    Astrogeology, the science that applies the principles of geology to the study of solid bodies of the solar system other than the earth. See more »

  • Astrophysics

    Astrophysics

    Astrophysics, the application of the theories and techniques of modern physics to astronomy. See more »

  • Autumn

    Autumn

    Autumn, or Fall, the season of the year that follows summer and comes before winter. See more »

  • Azimuth

    Azimuth

    Azimuth, the horizontal direction of an object, measured clockwise in degrees, minutes, and seconds of arc from true north or south along the theoretical horizon. See more »

  • Bolometer

    Bolometer

    Bolometer, an instrument used to measure infrared, or heat, radiation. The bolometer is essentially a very sensitive thermometer. See more »

  • Brown Dwarf

    Brown Dwarf

    Brown Dwarf, a celestial object more massive than a planet but less massive than a star. See more »

  • Calendar

    Calendar

    Calendar, a system of dividing time into convenient periods of days, months, and years. See more »

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