Two more planets in our Solar System, say astronomers

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The Solar System has at least two more planets waiting to be discovered beyond the orbit of Pluto, Spanish and British astronomers say. Beyond Neptune, Pluto was relegated to the status of "dwarf planet" by the International Astronomical Union in 2006, although it is still championed by some as the most distant planet from the Sun. In a study published in the latest issue of the British journal Monthly Notices of the Royal Astronomical Society, researchers propose that "at least two" planets lie beyond Pluto. An AU, a measurement of Solar System distance, is the span between Earth and the Sun -- nearly 150 million kilometres (almost 93 million miles).

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