Space refers to the physical extent beyond the Earth's atmosphere, encompassing a vast, near-vacuum environment governed by the principles of physics. It is characterized by immense distances and the presence of celestial bodies, such as stars, galaxies, and nebulae, which are primarily collections of matter held together by gravitational forces. The background radiation permeating this region, such as the cosmic microwave background, provides crucial data regarding the early thermal history of the universe. Scientific study of space investigates fundamental concepts like general relativity, stellar evolution, and the formation of large-scale galactic structures, providing insights into the physical conditions and matter distribution across cosmological scales.