Scientists found 3 medium planets around a sun like star 41 light-years away in the constellation Puppis (the Stern) using the Doppler or "wobble," technique (the astronomers infer the presence of a planet by measuring the gravitational influence it exerts on its parent star).
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"For the first time, we have discovered a planetary system composed of several Neptune-mass planets," said study team member Christophe Lovis of the Geneva Observatory in Switzerland.
The setup is similar to our own solar system in many ways: The outermost planet is located just within the star's habitable zone, where temperatures are moderate enough for liquid water to form, and the system also contains an asteroid belt.
The newly discovered planets have masses of about 10, 12 and 18 times that of Earth and they zip around the star in rapid orbits of about 9, 32 and 197 days, respectively.