Planet
Planet
Planet (pronunciation: /ˈplæn.ɪt/) is a celestial body that orbits around a star, is not a satellite of a planet, and has cleared its orbit of other debris. The term originates from the Greek word "planetes" which means "wanderer", reflecting the movement of planets in the sky relative to the stars.
Etymology
The word "planet" comes from the Ancient Greek word "πλάνης" (planēs), which means "wanderer" or "roaming". This term was used to describe the way these celestial bodies moved across the sky, in contrast to the fixed stars.
Related Terms
- Star: A luminous sphere of plasma held together by its own gravity. The closest star to Earth is the Sun.
- Orbit: The gravitationally curved trajectory of an object, such as the trajectory of a planet around a star.
- Satellite: An object in space that orbits or revolves around another object. In the context of spaceflight, a satellite is an artificial object which has been intentionally placed into orbit.
- Celestial Body: A natural object in visible space, such as a planet, star, or moon.
- Debris: Scattered remnants or pieces of waste. In the context of space, debris refers to the remnants of satellites, rockets, and other objects left in orbit around a planet.
External links
- Medical encyclopedia article on Planet
- Wikipedia's article - Planet
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