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{{Update Science}}
This Abbreviated as '''AU,''' it is the mean distance from the [[Earth ]] to the [[Sol|Sun, i.e. ]] 149,597,870 km871 kilometers (92,955,807. (approx 93 million 3 miles);.
The A magnetosphere is a region of space surrounding an astronomical object, in which a planetcharged particles are affected by that object's magnetic field dominates . <br> [[Planet]]s that have an active magnetospheres are capable of mitigating or blocking the effects of solar windradiation or cosmic radiation. This protects all living organisms from potentially detrimental and dangerous consequences.
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.
A Abbreviated as '''pc,''' it is a unit for expressing of measurement used to express large distancesto [[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 3.2616 26163344 [[Light year|light years, ]] 206,265 264.806 [[Astronomical Terms Database#Astronomical Unit|astronomical units ,]] or 30,856,775,800,000 kilometers (AU19,173,511,600,000 miles) or 30.857 * 10E12 km.Penumbra:
A Also referred to as “multiple star system,” it is a set of a few [[Gravity|gravitationally]] bound stellar objects , such as [[Star|stars,]] that [[Orbit|orbit]] each other. A set of many such stellar objects , or [[Star|stars,]] is a [[Astronomical Terms Database#Star Cluster|star cluster. ]] See "also [[Astronomical Terms Database#Binary Star|“Binary Star Cluster," ”]] above. Compare "Planetary System," above. See also [[Star system|star system.]]; and [[Astronomical Terms Database#Planetary System|“Planetary System,”]] above.
edited description for "magnetosphere"
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=== Absolute Magnitude ===
The [[Astronomical Terms Database#Apparent Magnitude|apparent magnitude ]] that a [[Star|star]] would possess if it were a distance of 10 [[Astronomical Terms Database#Parsec|parsecs ]] from [[Earth|Earth.]] In this way, absolute magnitude provides a direct comparison of the brightness of [[Star|stars.]] A [[Star|star’s]] [[Astronomical Terms Database#Luminosity|luminosity ]] and its distance from [[Earth]] provide the basis for its [[Astronomical Terms Database#Apparent Magnitude|apparent magnitude. ]] If all [[Star|stars]] were the same distance from [[Earth|Earth,]] then their [[Astronomical Terms Database#Apparent Magnitude|apparent magnitudes ]] would only be dependent on their [[Astronomical Terms Database#Luminosity|luminosities. ]] Therefore, absolute magnitudes are true indicators of the amount of [[Light|light]] each [[Star|star]] emits. The value is lower, even into the negatives, for objects that appear brighter, and higher for objects that appear dimmer. Absolute magnitude is usually measured through the visible spectrum. However, it can be measured through the entire spectrum. Absolute visual magnitude, through the visible spectrum, is abbreviated as '''''Mv.''''' Compare "[[Astronomical Terms Database#Apparent Magnitude|“Apparent Magnitude," ”]] below.
=== Accretion ===
=== Apparent Magnitude ===
A measure of how bright an [[Astronomical Terms Database#Astronomical Object|astronomical object, ]] as viewed from [[Earth|Earth,]] appears to be to the naked [[Human]] eye, but calculated to a value that negates any interference from [[Earth|Earth's]] atmosphere. The value is lower, even into the negatives, for objects that appear brighter, and higher for objects that appear dimmer. Unless otherwise indicated, apparent magnitude is usually measured through the visible spectrum. However, it can be measured through specific wavelengths, such as near infra-red. Apparent magnitude is abbreviated as '''''m.''''' Compare "[[Astronomical Terms Database#Absolute Magnitude|“Absolute Magnitude," ”]] above.
=== Arc Minute ===
=== Astronomical Object ===
Naturally occurring structures that exist in observable [[Space|space.]] [[Asteroid|Asteroids,]] [[Moon|moons,]] [[Planet|planets,]] and [[Star|stars]] are examples of single astronomical objects. [[Nebula|Nebulae,]] [[Astronomical Terms Database#Star systemSystem|star systems,]] [[Astronomical Terms Database#Star Cluster|star clusters, ]] and [[Galaxy|galaxies]] are examples of compound astronomical objects.
=== Astronomical Unit ===
=== Aurora ===
=== Binary Star ===
A [[Astronomical Terms Database#Star System|system of two stars ]] [[Orbit|orbiting ]] around a common centre of mass due to their mutual [[Gravity|gravity. ]] Binary stars are twins in the sense that they formed together out of the same interstellar cloud. See also [[Astronomical Terms Database#Star System|“Star System,”]] below; compare [[Astronomical Terms Database#Optical Binary|“Optical Binary,”]] below.
=== Blue Moon ===
=== Dwarf Star ===
A [[Star|star, which ]] that lies on the main sequence and is too small to be classified as a giant star or a supergiant star. For example, the [[Sol|Sun ]] is a yellow dwarf star.See also the [[Star Classification Table|Star Classification Table.]]
=== Luminosity ===
Absolute brightness. The total [[Energy|energy ]] radiated into [[Space|space, ]] per second, by a celestial an [[Astronomical Terms Database#Astronomical Object|astronomical object ,]] such as a [[Star|star.]] Compare [[Astronomical Terms Database#Absolute Magnitude|“Absolute Magnitude,”]] above.
=== Lunation ===
=== Magnetosphere ===
=== Magnitude ===
=== Moon ===
A naturally occurring satellite, or relatively large body, orbiting a planet.
=== Multiple Star System ===
See [[Astronomical Terms Database#Star System|“Star System,”]] below.
=== Optical Binary ===
=== Orbit ===
=== Parsec ===
=== Penumbra ===
Means, literally, "dim light". It most often refers to the outer shadow cast during eclipses, and defines the region of shadow which gives rise to a partial eclipse. It is also the lighter area surrounding the central region of a sunspot.
=== 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 ===
=== Star Cluster ===
A loose association of [[Star|stars ]] within the the [[Milky WayGalaxy|Milky Way Galaxy. ]] Examples are include the Pleiades (, also known as the Seven Sisters) , the Hyades clusters, and the Beehive Clusters, each visible from [[Earth|Earth,]] to the naked [[Human]] eye.
=== Star System ===
=== Sunspot ===
=== White Dwarf ===
A whitish [[Star|star, ]] of up to 1.4 Solar masses, and about the size of the [[Earth ]] with consequential very high density, characterized by a high surface temperature and low brightness.
=== Worm Hole ===
