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astronomy terms library
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.
Albedo
Albedo, in astronomy, the reflecting power of a celestial body that is not self-luminous.
See more »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, 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, the application of the theories and techniques of modern physics to astronomy.
See more »Aurora Borealis
Aurora Borealis, or Northern Lights, a glow in the night sky in the regions near the north magnetic pole.
See more »Autumn
Autumn, or Fall, the season of the year that follows summer and comes before winter.
See more »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, an instrument used to measure infrared, or heat, radiation. The bolometer is essentially a very sensitive thermometer.
See more »Brown Dwarf
Brown Dwarf, a celestial object more massive than a planet but less massive than a star.
See more »Calendar
Calendar, a system of dividing time into convenient periods of days, months, and years.
See more »Can scientists recreate the big bang?
Modern science allows us to break atoms down into tiny components. But can scientists use their mighty machines to recreate the foundation of the universe?
See more »Chronology
Chronology, the science of measuring time. Chronology divides time into regular divisions or periods, and assigns events their proper place and sequence by giving them dates.
See more »Chronometer
Chronometer, a timepiece that is exceptionally accurate. Traditionally, the term refers to the marine chronometer, a rugged mechanical instrument used at sea to keep time for navigational purposes.
See more »Corona
Corona, the outer portion of the sun's atmosphere. Normally, the corona is visible only during a total solar eclipse, when it appears as an irregular whitish halo around the darkened sphere of the sun.
See more »Cosmic Rays
Cosmic Rays, high-energy radiation consisting chiefly of subatomic particles moving at nearly the speed of light.
See more »Cosmogony
Cosmogony, the study of the origin and development of the universe as a whole and of the individual bodies that compose it.
See more »Cosmology
Cosmology, the study of the universe. It is both a scientific subject and a philosophical one.
See more »Day
Day, in astronomy, the average length of time between successive noons. Noon is defined as the instant when the sun is highest in the sky.
See more »Double Star
Double Star, a pair of closely-spaced stars that to the unaided eye usually appear as a single star.
See more »Eclipse
Eclipse. An eclipse of the sun, or solar eclipse, occurs when the moon's shadow sweeps across the earth.
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