Several objects were called planets when they were originally discovered, but are no longercalled planets.

Question

Quizplus · Accepted Answer

This is true because there were several objects that were considered planets at one point in time, such as Ceres, Pluto, and even Earth. However, our understanding and definition of what constitutes a planet has changed over time, and these objects are no longer classified as planets. This is true, as several objects that were once classified as planets were later reclassified as dwarf planets or other celestial bodies, such as Ceres, Pluto, and Eris.

Several Objects Were Called Planets When They Were Originally Discovered