The changing faces of Pluto| The predominant color of Pluto's surface is thought to result from ultraviolet radiation from the distant Sun breaking down methane on the planet's surface, leaving a dark ...
Famously, Pluto no longer met the criteria and was demoted to a dwarf planet. Things have been a bit of a mess since then — so is it time to redefine the planet? Astronomers were comfortable ...
In 2006, the International Astronomical Union (IAU) voted on the definition of a planet. Famously, Pluto no longer met the criteria and was demoted to a dwarf planet. Things have been a bit of a mess ...
From afar, Pluto once seemed boring and dead. After all, the dwarf planet is only two-thirds the size of our moon and resides more than 30 times farther out from the sun than does Earth.