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Earth & Space Science General Science High School Middle School
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These resources can support teachers in implementing the Why isn't Pluto a planet anymore? Daily Do
Description: Provides information on the timing of Ceres' (and Pallas, Juno and Vesta's) reclassification from planets to asteroids. While astronomer William Herschel, famed discover of Uranus, began the conversation as early as 1802, this NASA resource identifies 1863 as the year Ceres was widely accepted as an asteroid.
Description: This Excel spreadsheet includes Table 1. Planets Identified on A Plan or Map of the Solar System Projected for Schools and Academies (1846) and Table 2. Planets Identified on Rand McNally's Modern Space Map (c. 1950)