Nebula
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A nebula, from the Latin word for cloud, is a cloud of interstellar dust and gases. [1]. Nebulae have been observed both within the Milky Way galaxy and in other galaxies. These large clouds of mostly hydrogen gas can form stars, as likely happened to our solar system about 4.6 billion years ago. [2]
External Links
Some spectacular pictures from the Hubble Telescope, which include many nebulae