The old solar system -- A hidden planet -- Too far to see -- A lucky accident -- Not like other planets -- How big is a planet? -- An official definition -- So what is Pluto? -- Other dwarf planets -- Love for Pluto -- A planet again?.
Summary:
"For many years, children learned in school that there are nine planets in our solar system. The ninth planet, Pluto, was discovered in 1930. However, in 2006, Pluto was demoted. Why did this happen after nearly 80 years? What sets a planet apart from an asteroid, comet, or other celestial body? What exactly is a dwarf planet-Pluto's new designation? Readers learn the answers to these questions and more through engaging text, augmented by informative fact boxes and full-color photographs"-- Provided by publisher.
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.