Twenty years after Pluto lost its planetary status, the debate continues as scientists still disagree over what defines a planet.

Image taken by NASA's Hubble Space Telescope, shows five moons orbiting the distant, icy dwarf planet Pluto.NASA / ESA Back in the 1980’s, a now-defunct magazine called Science Digest held a contest ...

In August of 2006, astronomers at the International Astronomical Union (IAU) democratically voted to reclassify Pluto as a dwarf planet — but 20 years later, with our greater knowledge and ...

Two decades after Pluto was reclassified as a dwarf planet, scientists remain divided over the definition that removed it from the solar system’s traditional list of planets. The disagreement comes ...

Pluto was downgraded from a planet to a dwarf planet in 2006 by the International Astronomical Union. NASA Administrator Jared Isaacman has stated his support for President Trump to take action to ...

Pluto was downgraded from a planet to a dwarf planet in 2006 by the International Astronomical Union. The main reason for Pluto's demotion is that it's not able to "clear its orbit of debris." Other ...