Kepler-30 lies about 10,000 light-years away and is roughly as bright and massive as the Sun. Observations by NASA's Kepler spacecraft have revealed the presence of three planets: one with about 4 times the diameter of Earth in a 29-day orbit, and two others each about 10 times the size of Earth in a 60-day and 143-day orbit, respectively. All three share the same orbital plane to within a few degrees. Not only that but their orbits are closely aligned with the rotational plane of the central star – as in the case of the planets in the solar system. This last fact could be established because Kepler observed a large spot on the star's surface in front of which all three planets pass.
Related category EXTRASOLAR PLANETS AND SUBSTELLAR OBJECTS
External linkA far-off solar system (MIT)
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