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・ Satellite Data System
・ Satellite Data Unit
・ Satellite delay
・ Satellite digital imaging system
・ Satellite dish
・ Satellite Distribution System
・ Satellite DNA
・ Satellite emergency notification device
・ Satellite EP
・ Satellite FC
・ Satellite FC Abidjan
・ Satellite finder
・ Satellite flare
・ Satellite formation flying
・ Satellite galaxies of the Milky Way
Satellite galaxy
・ Satellite geodesy
・ Satellite geolocation
・ Satellite glial cell
・ Satellite High School
・ Satellite Home Viewer Act
・ Satellite Home Viewer Reauthorization Act
・ Satellite Image Time Series
・ Satellite imagery
・ Satellite in the Sky
・ Satellite Information Services
・ Satellite Instructional Television Experiment
・ Satellite insurance
・ Satellite Internet access
・ Satellite IRG


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Satellite galaxy : ウィキペディア英語版
Satellite galaxy

A satellite galaxy is a galaxy that orbits a larger galaxy due to gravitational attraction.〔(【引用サイトリンク】url=http://www.mpa-garching.mpg.de/~lsales/SatelliteGalaxies.html )〕 Although a galaxy is made of a large number of objects (such as stars, planets, and nebulae) that are not connected to each other, it has a center of mass, which represents a weighted average (by mass) of the positions of each component object. This is similar to how an everyday object has a center of mass which is the weighted average of the positions of all its component atoms.〔
In a pair of orbiting galaxies, if one is considerably larger than the other, then the larger is the "primary" and the smaller is the satellite.〔 If two orbiting galaxies are about the same size, then they are said to form a binary system.
Galaxies which encounter one another from certain directions may interact: collide, merge, rip each other apart, or transfer some member objects. In these situations, it can be difficult to tell where one galaxy ends and where another begins. "Collisions" between galaxies do not necessarily involve collisions between objects from one galaxy and objects from the other, since galaxies are mostly empty space. Rather, gravitational forces from nearby clouds of matter are capable of distorting one another, or bringing a clump of mass from one galaxy over into another.
==References==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Satellite galaxy」の詳細全文を読む



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