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Space is the vast, three-dimensional expanse that surrounds the Earth and all other celestial bodies. It is commonly referred to as the universe, which includes all matter and energy, including planets, stars, galaxies, and other cosmic objects. Space is characterized by its emptiness, with a vacuum that allows for the movement of light and other electromagnetic waves. It is also defined by its temperature, which can range from near absolute zero to millions of degrees Celsius. Space exploration has been a key area of scientific research for many years, with numerous space missions and telescopes providing valuable insights into the nature of the universe.