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Astronomy & Telescope Astronomy: Galaxy

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  Galaxy Galaxy: Astronomy: Galaxy - Spiral-SPIRAL STRUCTURE

SPIRAL STRUCTURE

The most common galaxies in the universe are dwarf ellipticals and irregulars, but by far the largest proportion of bright galaxies—about 75 percent—are spirals. These systems range from 15,000 to 150,000 light-years in diameter and may contain several hundred billion stars in a flattened disk.

 
 
  Posted by astronomy on Thursday, December 02 @ 14:23:09 CST (10 reads)
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  Galaxy Galaxy: Astronomy: Galaxy - OTHER SHAPES AND TYPES

OTHER SHAPES AND TYPES

Galaxies with shapes that fall between the elliptical and spiral categories—such as NGC 1201 in Fornax—are called lenticular galaxies. Lenticulars have a central nucleus as spiral galaxies do, but, like the ellipticals, show little or no evidence of spiral structure. They contain mostly old stars and very little gas.

 
 
  Posted by astronomy on Thursday, December 02 @ 14:22:20 CST (11 reads)
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  Galaxy Galaxy: Astronomy: Galaxy - OBSERVING GALAXIES

OBSERVING GALAXIES

Whether a galaxy is challenging or easy to observe depends on several factors, not the least of which is the galaxy's apparent magnitude. But magnitude means little or nothing unless you also consider its apparent diameter. Face-on galaxies have low surface brightness, which can make them difficult to locate against a bright sky background.

 
 
  Posted by astronomy on Thursday, December 02 @ 14:21:30 CST (10 reads)
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  Galaxy Galaxy: Astronomy: Galaxy - GALAXY CLUSTERS

GALAXY CLUSTERS

If we step back and look at the universe of galaxies, we see that they, like stars, congregate into clusters.

 
 
  Posted by astronomy on Thursday, December 02 @ 14:20:40 CST (11 reads)
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  Galaxy Galaxy: Astronomy: Galaxy - ELLIPTICALS

ELLIPTICALS

Elliptical galaxies tend to be shaped like footballs or spheres. The largest, and rarest, ellipticals have a diameter of at least 100,000 light-years, and may contain more than 10,000 billion stars.

 
 
  Posted by astronomy on Thursday, December 02 @ 14:19:55 CST (10 reads)
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  Galaxy Galaxy: Astronomy: Galaxy

GALAXIES

Through a telescope, galaxies appear as delicate whorls of soft light, some barely visible, others distinct and surprisingly symmetrical.

 
 
  Posted by astronomy on Thursday, December 02 @ 14:18:52 CST (10 reads)
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