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A Whole New Universe

That nine-planet mobile of the solar system may someday be an archaic marvel for your children's children. If the International Astronomical Union decides Thursday to add three new planets, it means redemption for Pluto fans, but overhaul time for toys, textbooks and planetariums around the world.

It'll be about seven years before most schools have textbooks that reflect the addition of Ceres, Charon, and UB313, nicknamed Xena. Lucky for parents, toy makers work much faster: Discovery Channel Store spokeswoman Pamela Rucker predicted new 12-planet toys could be in stores in time for the Christmas season.

Planetariums and museums find the challenge more exciting than difficult, said Susan Reynolds Button, president-elect of the International Planetarium Society. Students will need a new mnemonic to remember the expanded list.

The astronomers could still vote against the new planets. That would be fine with the man who discovered Xena, Michael Brown, who thinks the proposed definition for planets is too broad and amounts to "No Ice Ball Left Behind." By the time his infant daughter is old enough to memorize planets, he complains, there could be hundreds of them.

"When people finally realize the number of planets is going to be much bigger, they'll shake their heads and say 'Astronomers are crazy.'" Brown said. Crazy enough to name a planet after a TV warrior princess?

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