Learn all about the dwarf planet Ceres, ... Juno in 1804 and Vesta in 1807. They couldn't all be planets. Indeed, they seemed too small; unlike Mars and Jupiter, ...

Then another “planet” was discovered. On March 28, 1802, German physician and astronomer Heinrich Olbers discovered Pallas; this was rapidly followed by Juno in 1804 and Vesta in 1807.

Juno, the 11th-largest asteroid, is now visible through binoculars. ... which has recently been reclassified as a dwarf planet and is the only denizen of the asteroid belt known to be spherical in ...

Two previous missions—the Dawn spacecraft now orbiting the dwarf planet Ceres, ... Juno’s big contribution is demonstrating that these advanced arrays can be used so far from the Sun, ...

But Pluto turned out to be too tiny — it is smaller than the moon — and was demoted to dwarf planet status in 2006. There are now four other officially recognized dwarf planets, and Cheng ...