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date: 22 May 2024


A Dictionary of Astronomy

Ian Ridpath

Everything that exists, including space, time, and matter. The study of the Universe is known as *cosmology. Cosmologists distinguish between the Universe with a capital ‘U’, meaning the cosmos and all its contents, and universe with a small ‘u’, which is usually a mathematical model derived from some physical theory. The real Universe consists mostly of apparently empty space, with matter concentrated into galaxies consisting of stars and gas. The Universe is expanding, so the space between galaxies is gradually stretching, causing a ... ...

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