Space Exploration is the ongoing investigation of the environment beyond Earth's atmosphere. It involves the in-depth examination of relatively close celestial bodies such as the sun, planets and moons, as well as the distant observation of stars, galaxies and other cosmic phenomena.
Space exploration relies on a number of advanced technological developments. Large, sophisticated telescopes are used to observe distant objects, using all the wavelengths of the electromagnetic spectrum, including visible light, radio waves and infrared light. Robotic space probes and manned spaceflight are used to investigate nearby objects such as planets and moons, as well as investigate phenomena unique to the microgravity and vacuum environment of space