Aug. 24, aka #PlutoDemotedDay, is when Pluto became a dwarf planet. For 76 years — from its discovery in 1930 until 2006 — Pluto was considered a planet.

Pluto may have lost its status as a full-fledged planet in 2006, but that doesn't mean it's a joke of a world this April Fools' Day and the folks behind Pluto TV want to make that clear.

On Aug. 24, 2006, the International Astronomical Union voted to make Pluto a dwarf planet. New definitions were written for planets that excluded the formerly ninth planet.

Once believed to be the ninth planet from the sun, Pluto lost its planet status in 2006 — causing controversy both scientifically and culturally.

After months of debate, an IAU executive committee proposed the definition that not only keeps Pluto but adds three planets: UB313; Pluto’s moon Charon; and the largest member of the asteroid ...

A single day on Pluto is as long as 6.9 Earth days. Tomorrow, Feb. 18 is Pluto Day. You may ask yourself why Pluto has its own day since it is no longer considered a planet of our solar system.

Pluto has never been much of a planet — small, wired orbit, not much atmosphere — and questions about its status have been raised periodically since its discovery 76 years ...

Once believed to be the ninth planet from the sun, Pluto lost its planet status in 2006 — causing controversy both scientifically and culturally.