Yes. In the early decades of the 1800s, the asteroids Ceres, Pallas, Juno, and Vesta were commonly included in the list of planets. The number of known asteroid

Yes. In the early decades of the 1800s, the asteroids Ceres, Pallas, Juno, and Vesta were commonly included in the list of planets. The number of known asteroids exploded in the 1840s and 50s with the 100th being discovered in 1868. I'm not actually sure when schoolchildren stopped memorizing their names.