The relative quantities of volatile gases like methane and ethane can reveal key details about distant Kuiper Belt objects.

“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 ...

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

A New Horizons image of Pluto and its moon Charon revealed more surprises about the dwarf planet and its orbiting ... How do we know the Big Bang actually happened? documentHow do we know the ...

Nevertheless, because it orbited the Sun like a planet, it was classified as a ... Soon, they had discovered several worlds almost as big as Pluto and in 2003 they identified an object which ...

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 ...