Pluto stays put in Maine's solar system

Driving south, it's hard to miss large planets like Jupiter, which is 5 feet in diameter and weighs close to a ton. The solar system ends 40 miles later with tiny Pluto, only 1 inch in diameter, mounted on the wall of a visitor information center.

"We're not planning on taking down Pluto," said McCartney...

...If astronomers keep discovering new dwarf planets, McCartney conjectured, the solar system model could one day stretch all the way down the coast."