The eight planets: an explanation (including "Why does Neptune count?")
On August 24, 2006, astronomers declared that Pluto is no longer a planet, thereby downsizing the solar system from nine planets to eight. After a week of debate, the International Astronomical Union stripped Pluto of planetary status because its orbit cr
This archive of New York Times news articles, editorials, and letters to the editor chronicles Pluto's recent history.
"Pluto is now officially classified as a dwarf planet.
