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Galaxies
Galaxies are a massive collection of stars and dark matter, ranging from a few million stars (dwarf galaxies) to hundreds of billions of stars (giant galaxies). Most galaxies are disk shaped and are tens of thousands of light years in diameter. Galaxies are categorized by three broad shapes - spiral galaxies, elliptical galaxies and peculiar galaxies. It is estimated that observable universe has more than 100 billion galaxies.
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