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At least five planets are orbiting the Sun-like star HD 10180, and the regular pattern of their orbits is similar to that observed for our neighbouring planets. One of the new extrasolar worlds could be only 1.4 times the mass of the Earth, making it the least massive exoplanet (planet outside the Solar System) ever found.   Definitions:   Titius-Bode Law - a hypothesis that orbits of planets in the solar system follow a definite exponential pattern.   Wikipedia: HARPS HD 10180  Articles:   BBC   NYTimes

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