In 2006, the International Astronomical Union kicked Pluto off its planetary pedestal. In his delightful book How I Killed Pluto and Why It Had It Coming (Bookshop|Amazon) astronomer Mike Brown recounts the events leading up to the demotion of that...
In addition to the eight planets in our solar system, there are also more than a million minor planets, including five so-called dwarf planets, plus hundreds of thousands of asteroids. When an astronomer or amateur stargazer discovers one, they get...
Astronomers have spotted nearly 150 objects far out in space that are too small to be called stars, but they can’t be called planets, because they don’t orbit a star. They’re about the size of Jupiter, but given what we know about...
