satelliitid

Satelliitid are artificial objects deliberately placed into orbit around a celestial body, most commonly the Earth. These objects can serve a wide range of purposes, from scientific research and communication to navigation and observation. The concept of an artificial satellite dates back to early 20th-century scientific speculation, but the first actual satellite, Sputnik 1, was launched by the Soviet Union in 1957, marking the beginning of the Space Age.

Satellites are typically launched into space using rockets. Once in orbit, they can maintain their trajectory for extended periods, powered by onboard systems, solar panels, or other energy sources. The design and function of a satellite vary greatly depending on its mission. For example, communication satellites relay signals for television, radio, and internet services, while meteorological satellites monitor weather patterns and climate change. Earth observation satellites can be used for mapping, resource management, and environmental monitoring.

Navigation satellites, such as those in the Global Positioning System (GPS), provide precise location data to receivers on the ground. Scientific satellites, in contrast, are equipped with instruments to study celestial bodies, the Sun, or the Earth's atmosphere and magnetosphere. The data collected by satellites has revolutionized our understanding of the universe and our own planet, contributing to advancements in numerous fields. The ongoing development of satellite technology continues to expand their capabilities and applications.