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A Also known as “visual binary,” it is a pair of [[Star|stars which ]] that happen to lie close to one another on the celestial sphere because of a chance alignment. They The [[Star|stars]] are not physically associated with one another and lie at vastly different distances. Optical binaries are also known as visual binariesCompare [[Astronomical Terms Database#Binary Star|“Binary Star,”]] above.
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=== Astronomical Unit ===
Abbreviated as '''“AUAU,”''' it is the mean distance from the [[Earth]] to the [[Sol|Sun,]] 149,597,871 kilometers (92,955,807.3 miles).
=== Aurora ===
=== Binary Star ===
A system of two stars orbiting around a common centre of mass due to their mutual gravity. Binary stars are twins in the sense that they formed together out of the same interstellar cloud. Compare See also [[Astronomical Terms Database#Star System|“Star System,”]] below; compare [[Astronomical Terms Database#Optical Binary|“Optical Binary,”]] below.
=== Blue Moon ===
=== Luminosity ===
Absolute brightness. The total [[Energy|energy ]] radiated into [[Space|space,]] per second, by an [[Astronomical Terms Database#Astronomical Object|astronomical object,]] such as a [[Star|star.]] Compare [[Astronomical Terms Database#Absolute Magnitude|“Absolute Magnitude,”]] above.
=== Lunation ===
=== Optical Binary ===
=== Orbit ===
=== Parsec ===
Abbreviated as '''“pcpc,”''' it is a unit of measurement used to express large distances to [[Astronomical Terms Database#Astronomical Object|astronomical objects]] beyond [[Earth|Earth’s]] [[Sol system|Solar System.]] It is the distance at which a [[Star|star]] would have a [[Astronomical Terms Database#Parallax|parallax]] of one arc second, equal to 3.26163344 [[Light year|light years,]] 206,264.806 [[Astronomical Terms Database#Astronomical Unit|astronomical units,]] or 30,856,775,800,000 kilometers (19,173,511,600,000 miles).
=== Penumbra ===
=== Planetary System ===
A set of [[Gravity|gravitationally]] bound non-stellar [[Astronomical Terms Database#Astronomical Object|astronomical objects ]] that [[Orbit|orbit]] a [[Star|star]] or a [[Astronomical Terms Database#Star systemSystem|star system.]] Compare "[[Astronomical Terms Database#Star System|“Star System," ”]] below.
=== Planisphere ===
