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

For the better part of a century, we believed there were nine planets in our solar system, with Pluto being the farthest from the sun. Since the discovery of more Pluto-sized dwarf planets, that ...

“New Horizons shattered a major paradigm of planetary science,” says Alan Stern, the mission’s principal investigator. “Pluto turns out to have as much complexity as Mars or Earth, so much so that I ...

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

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 ...

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.

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 surprising chemical difference between Pluto and Sedna, another dwarf planet in the distant Kuiper Belt ... One assumed ...

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 ...