Out of This World

September 2006
Scholastic News -- Edition 4;9/11/2006, Vol. 69 Issue 2, p3
This article reports on a recent meeting of an international group of astronomers in Europe and voted on a new definition of what constitutes a planet which led to the dropping of Pluto from the list. Eight classical planets remain, including Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Scientists now define a planet as a nearly round object that orbits the sun and whose orbit does not cross that of another planet. Pluto was excluded because its orbit overlaps Neptune's.


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