Space is the vast, three-dimensional expanse that surrounds the Earth and the rest of the universe. It is often defined as the area beyond the Earth's atmosphere, where there is no air or other substances that can interfere with the movement of celestial bodies.

Space has been the subject of scientific study for centuries, and the exploration of space has been a major focus of human endeavour for much of the past century. Space exploration has provided us with a wealth of knowledge about our solar system and the universe as a whole, and has led to many technological advancements that have had a significant impact on our daily lives.

One of the most important aspects of space is its near-emptiness. While space is not completely empty, it is characterised by a very low density of matter and a high degree of vacuum. This makes it an ideal environment for studying the behaviour of objects in motion, such as planets and stars.

Space is also home to a variety of objects and phenomena that are of great interest to scientists. These include asteroids, comets, stars, and galaxies, as well as phenomena such as black holes, supernovae, and gamma-ray bursts.

The study of space has also led to many technological advancements, particularly in the fields of telecommunications and satellite imagery. Satellites in orbit around the Earth are used to provide a wide range of services, including television and radio broadcasting, weather forecasting, and navigation.