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According to Kepler's laws of planetary motion, planetary orbits are in the shape of an ellipse with the Sun at one of the foci.
The Moon is the planetary body that orbits the Earth.
Johannes Kepler was the person who first showed that planetary orbits are ellipses. His work, published in 1609, is known as Kepler's first law of planetary motion.
The Cats's Eye Nebula is a perfect example of a planetary nebula. See related link for a pictorial.
They all obey Kepler's 3 laws of planetary motion.