Perturbation is a term used in astronomy to describe alterations to an object's orbit caused by gravitational interactions with other bodies. For example, the orbits of comets are often perturbed by the gravitational fields of the giant planets - Jupiter's gravitational influence caused the period of Comet Hale-Bopp's orbit to increase from 2800 to 4200 years. Astrology: the study of the positions of the celestial objects relative to the Earth and how these positions affect happenings on the lives of cultures, nations and the natural environment. ... In physics, an orbit is the path that an object makes, around another object, whilst under the influence of a source of centripetal force, such as gravity. ... ... Comet Hale-Bopp A comet is a small body in the solar system that orbits the sun and (at least occasionally) exhibits a coma (or atmosphere) and/or a tail — both due primarily to the effects of solar radiation upon the comets nucleus, which itself is a minor planet... A gas giant is a large planet that is not composed mostly of rock or other solid matter. ... Adjective Jovian Atmospheric characteristics Atmospheric pressure 70 kPa Hydrogen ~86% Helium ~14% Methane 0. ... A close-up of Hale-Bopp Comet Hale-Bopp (formally designated C/1995 O1) was probably the most widely observed comet of the 20th century, and one of the brightest seen for many decades. ...
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