välisõhuruumis

Välisõhuruum, meaning "outer space" in Estonian, refers to the region beyond Earth's atmosphere. It is a vast expanse that begins where the atmosphere becomes too thin to support life as we know it. This boundary is not precisely defined but is often considered to be the Kármán line, located approximately 100 kilometers (62 miles) above sea level.

Outer space is characterized by extremely low pressure and temperature, and a near-perfect vacuum. It is filled with celestial bodies such as planets, stars, galaxies, and nebulae, as well as various forms of radiation and particles. The vast distances between these objects are measured in light-years, the distance light travels in one year.

Human exploration of outer space began in the mid-20th century with the launch of satellites and crewed missions. Since then, numerous spacecraft have been sent to study planets, moons, asteroids, and other celestial phenomena within our solar system and beyond. The study of outer space, known as astronomy and astrophysics, has significantly expanded our understanding of the universe and our place within it. International cooperation plays a crucial role in space exploration, with agencies from various countries collaborating on ambitious projects.