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Space is almost a perfect vacuum, the region between celestial bodies filled with radiation, particles, dark matter, and energy. It begins approximately at the Kármán line.
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Interesting factsThe age of the Universe is about 13.8 billion yearsThe observable Universe has a radius of about 46.5 billion light-yearsThere is no sound in space because there is no medium to carry sound wavesSpace is not completely empty - it contains ions, hydrogen atoms, and cosmic rays.