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Part 1

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تصویر از سحاب لاگون، بوسیله هابل اسکوپ

تصویر از سحاب لاگون، از طریق تلسکوپ جیمز وب

کهکشان راه شیری، تصویر مادون قرمز، تلسکوپ اسپیتزر

Simply put, the main difference between galaxies and nebulae are an extreme difference in size, as well as their basic structure. A nebula is a cloud of dust and gas, usually tens to hundreds of light years across. A galaxy is much larger — usually thousands to hundreds of thousands of light years across. Nebulae are one of the many things that galaxies are made of, along with stars, black holes, cosmic dust, dark matter and much more

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