That is the conclusion, to be announced today, of an international panel formed to devise a scientific definition of a planet and settle an increasingly intense dispute over whether Pluto qualifies. The panel suggests retaining Pluto and immediately adding three new planets to the nine that are familiar to any schoolchild: Ceres, currently considered a large asteroid; Charon, now considered a moon of Pluto; and Xena, a recently discovered object that is larger than Pluto.
But the group's proposal also makes clear that many more objects in the solar system -- perhaps dozens of them -- could qualify as planets after further study.
The new definition has been approved by the executive committee of the International Astronomical Union , and a vote of the union's general assembly is scheduled for Aug. 24 at a conference underway in Prague. If it is approved, which several astronomers said seems likely, the world's textbooks and museum displays would have to be updated -- not to mention solar system models, posters, software, and toys with only nine planets.
The change, scientists say, would be a mark of the great age of discovery that astronomy has entered over the last three decades, with the advent of space probes, powerful telescopes, and new observational techniques.
Topic: The solar system has 12 planets. (Read 3006 times)