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FRACTALS Fractals are, simply put, repetitions of an object or pattern at different scales. This concept and the math behind it have become studied more recently due to the availability of computer generated images. Fractals are beautiful to observe when created by computers, but are also readily observable in nature.
The orbits of some of the planets (e.g., Venus) are ellipses of such small eccentricity that they are essentially circles , and we can put artificial satellites into orbit around the Earth with circular orbits if we choose.
The orbits of the planets generally are ellipses .
Some comets have parabolic orbits; this means that they pass the Sun once and then leave the Solar System, never to return.
The gravitational interaction between two passing stars generally results in hyperbolic trajectories for the two stars.