Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory in Flagstaff. Here's how Pluto won - and lost - its planetary status.

Forbes contributors publish independent expert analyses and insights. Jamie Carter is an award-winning reporter who covers the night sky.

NASA on Friday released its first glimpse of a strange mosaic of ice on Pluto. WSJ's Robert Lee Hotz reports. Photo: NASA/JHUAPL/SwRI Trump Announces 25% Tariffs on All Cars Made Outside the U.S.

The water ice on the surface of the world suggests ... with the “dwarf planet” label continuing to rankle Pluto partisans.

Pluto — famous for being reclassified as a dwarf planet — might not have a heart of ice after all. In fact, every bit of Pluto was assumed to be frozen over considering its distance from the Sun.

According to data gathered from the New Horizons spacecraft, scientists say that Pluto is likely to have water ice, geysers, and volcanoes. The ice mountains are 11,000 feet high, and the planet's ...

Scientists are astonished by the incredible features they've observed on the dwarf planet ... we have reason to believe Pluto's heart is a bit warmer than the ice the covers it.

For 76 years, Pluto was considered the ninth planet of our Solar System ... a distant body of ice and rock in a vast abyss of ...

A blue atmosphere, smooth areas, and youthful mountain ranges - this dwarf planet is full of surprises. When NASA's New Horizons probe flew past Pluto in July 2015, the images it returned astonished ...

A New Horizons image of Pluto and its moon Charon revealed more surprises about the dwarf planet and its orbiting moon. Click on the hand to see why Pluto and its moon have shaken things up.

However, some scientists argue that Pluto should be considered a planet based on geological activity rather than orbital mechanics. NASA’s New Horizons mission revealed ice mountains ...