write a short note on orbit
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In physics, an orbit is the gravitationallycurved trajectory of an object,[1] such as the trajectory of a planet around a star or anatural satellite around a planet. Normally, orbit refers to a regularly repeating trajectory, although it may also refer to a non-repeating trajectory. To a close approximation, planets and satellites follow elliptic orbits, with thecentral mass being orbited at a focal point of the ellipse,[2] as described by Kepler's laws of planetary motion.
Current understanding of the mechanics of orbital motion is based on Albert Einstein'sgeneral theory of relativity, which accounts for gravity as due to curvature of spacetime, with orbits following geodesics. For ease of calculation, in most situations, orbital motion is adequately approximated by Newtonian mechanics, which explains gravity as a force obeying an inverse square law.[3]
Current understanding of the mechanics of orbital motion is based on Albert Einstein'sgeneral theory of relativity, which accounts for gravity as due to curvature of spacetime, with orbits following geodesics. For ease of calculation, in most situations, orbital motion is adequately approximated by Newtonian mechanics, which explains gravity as a force obeying an inverse square law.[3]
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