Pluto may have been downgraded from full-planet status, but that doesn't mean it doesn't hold a special place in scientist's ...

Philip Metzger, a planetary physicist who worked on NASA's New Horizons mission to Pluto, has previously pointed out that the ...

Mapping Pluto Broken Heart | This image was taken by the New Horizons Long Range Reconnaissance Imager (LORRI) on the morning ...

In the time Pluto was found, classified as a planet and reclassified as a dwarf planet, it has not completed one orbit. One ...

Though technically not a planet, it has as rich geology as any of its planetary siblings in the solar system A color-enhanced photo of Pluto that was captured by the New Horizons spacecraft in ...

Astronomers were comfortable with those classifications even when Clyde Tombaugh discovered Pluto in 1930. But that new planet was a stretch — it had a really wonky orbit and was far smaller ...

Things have been a mess since Pluto's demotion. In 2006, the International Astronomical Union (IAU) voted on the definition of a planet. Famously, Pluto no longer met the criteria and was demoted ...

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 ...