Several planets stand still in the sky, Titan’s shadow transits Saturn, and Venus gives Taurus a second eye in the sky this ...

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.

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 ...

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, ...

All 19 detections of the dwarf planet 2017 OF201, from August 2011 to October 2018. Credit... Cheng et al., arxiv.org, 2025. By Kenneth Chang.