Outer Space:
Astronomy - The scientific study of celestial objects and phenomena.
Astrophysics - The branch of physics that studies the physical properties and behaviour of objects in space.
Space exploration - The investigation of space through various means such as satellite launches, crewed missions, and robotic probes.
Orbital mechanics - The study of the motion of satellites and other objects in space.
Cosmology - The study of the origin, evolution, and structure of the universe.
Extra-terrestrial life - The search for and study of life outside of Earth.
Space debris - The collection of objects in orbit around Earth that are no longer functional.
Space weather - The study of the conditions in space that can affect Earth and human technology.
Space tourism - The industry of offering trips to space for recreational purposes.
Space medicine - The medical aspects of space travel and its effects on the human body.
Satellite technology - The design, development, and use of satellites for communication, navigation, and other purposes.
Rocket science - The study of rockets and their design, propulsion systems, and flight dynamics.
Space law - The body of law governing activities in space, including issues related to sovereignty, property rights, and liability.
Space policy - The policies and regulations established by governments and other organizations for the use and exploration of space.
Space architecture - The design and engineering of structures, habitats, and other facilities in space.
Space environment - The physical and atmospheric conditions in space and their effects on technology and human activity.
Space education - The study of space and space-related topics in schools and universities.
Space art and culture - The representation and interpretation of space and space-related themes in art, literature, and popular culture.
Space industry - The commercial sector that involves the production and sale of goods and services related to space exploration and satellite technology.
Space security - The protection of space-related assets and interests, including issues related to military use of space and the prevention of space debris.