空間 (Space) refers to the vast, seemingly infinite expanse that exists beyond Earth's atmosphere. It contains all celestial bodies, including stars, planets, and galaxies. Space is characterized by a near vacuum, meaning it has very low pressure and density, allowing objects to move freely without air resistance. In addition to physical matter, space is also a key concept in physics and mathematics, where it describes the three-dimensional extent in which objects and events occur. Understanding space is essential for fields like astronomy, astrophysics, and cosmology, which study the universe and its origins.