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Encyclopedia > Barred spiral galaxies
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  Results from FactBites:
 
Sea and Sky's Cosmic Wonders: Galaxies (1136 words)
Galaxies are defined as large groupings of stars, dust, and gas held together by gravity.
Spiral galaxies are represented by the letter S and are divided into four subgroups.
Barred spiral galaxies are represented by the letters SB and are arranges into three subgroups according to the openness of the arms.
barred spiral (246 words)
A type of spiral galaxy with a rectangular or cigar-shaped nucleus, from the ends of which spiral arms extend.
Bars are believed to represent a temporary stage in the life of some spiral systems.
Barred galaxies are grouped by their appearance using three criteria: the central bulge and light distribution; the tightness with which the spiral arms are wound; and the degree to which the spiral arms are resolved into stars and nebulae.
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