Space exploration

Space exploration is the investigation of outer space using robotic spacecraft and human missions beyond Earth. It includes observing distant objects and sending instruments or people to explore them directly.

Orbital mechanics: The study of how gravity and motion determine the paths of objects in space. Mission routes and launch windows depend on predicting spacecraft trajectories.
Apollo 11: The 1969 NASA mission that first landed humans on the Moon. Its landing demonstrated that people could travel to and work on another world.
Konstantin Tsiolkovsky: A Russian scientist whose theoretical work helped establish the foundations of astronautics. His rocket equation showed how staged rockets could reach space.
Earth observation satellite: An artificial satellite that gathers information about Earth's land, oceans, atmosphere, or living systems. Space missions use orbital vantage points to monitor planetary change.
Outer Space Treaty: A 1967 international treaty establishing basic principles for activities in outer space. It frames exploration as a domain governed by shared legal rules.
Rocket engine: A propulsion device that produces thrust by expelling mass. Rockets provide the thrust needed to escape Earth and maneuver in space.
Voyager program: NASA's twin-spacecraft mission launched in 1977 to study the outer planets and interstellar space. Voyager shows how robotic spacecraft can explore regions unreachable by crews.
Robert H. Goddard: An American physicist who pioneered practical liquid-fueled rockets. His experiments helped turn spaceflight from theory into engineering.
Astrobiology: The study of life's origin, evolution, distribution, and future in the universe. Exploration tests whether life exists or once existed beyond Earth.
Space debris: Nonfunctional human-made objects and fragments that remain in orbit around Earth. Decades of space activity have created collision hazards for current missions.

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