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| Zoom Astronomy The Stars |
| Lifecycle | Nuclear Fusion | Brightest Stars | Galaxies | Other Solar Systems | Constellations | Why Stars Twinkle | |
| Birth | Death | Star Types | Closest Stars | Nebulae | Major Stars | The Zodiac | Activities, Links |
| Spiral Galaxies | Elliptical Galaxies | Irregular Galaxies | Lenticular Galaxies | Active Galaxies | Clusters of Galaxies |
 The Perseus Galactic Cluster |
 The enormous and irregular Virgo Galactic Cluster. It is 50 million light-years from Earth (the closest major galactic cluster and the center of our Local Supercluster). It contains roughly 2,000 galaxies, a tremendous amount of hot gas and perhaps a black hole; the dominant (largest) galaxy is the elliptical M87 (Virgo A). |
| Some Galaxies in the Local Group | Diameter light-years | Distance light-years |
|---|---|---|
| Andromeda (M31) | 150,000 | 2,300,000 |
| Milky Way | 100,000 | n/a |
| Triangulum (M33) | 40,000 | 2,900,000 |
| Large Magellanic Cloud (LMC) | 30,000 | 163,000 |
| Small Magellanic Cloud (SMC) | 20,000 | 190,000 |
| NGC 6822 | 15,000 | 1,800,000 |
| NGC 205 | 11,000 | 2,200,000 |
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