Pluto was a planet in good standing for seventy-six years when in 2006, out of the blue, it was demoted and booted from our solar system’s family of planets.

If it weren't for the new budget, New Horizons could keep exploring the outer reaches of the solar system into the 2030s.

Pluto was demoted from a planet to a dwarf planet in 2006. So why is its status still so controversial today?

In 2006, the International Astronomical Union (IAU) famously demoted Pluto to a dwarf planet. Things have been a bit of a mess since then — so is it time to redefine the planet?

Planet X or not, Pluto existed. Smaller than the Moon, but inhabiting the realm of the giant planets, it defied our notions regarding the architecture of the Solar System.

Planet X or not, Pluto existed. Smaller than the Moon, but inhabiting the realm of the giant planets, it defied our notions regarding the architecture of the Solar System.

The case against Pluto's planet-ness According to The International Astronomical Union, Pluto is not a planet. The IAU shook the world in 2006 when it took Pluto's status as a planet away.

What's a Planet and Why Is Pluto Not in the Planet Club Anymore? by Andrew Fraknoi Although Seeing in the Dark doesn't directly discuss Pluto, it does celebrate the joy of observing planets.

Why is Pluto no longer a planet? Discover the real reason behind Pluto’s reclassification as a dwarf planet and the science that led to this change.

A group of planetary scientists argue that the definition of "planet" is outdated and suggest a definition that includes exoplanets.

In 2006, the International Astronomical Union (IAU) famously demoted Pluto to a dwarf planet. Things have been a bit of a mess since then — so is it time to redefine the planet?