Pluto is about 1,400 miles (2,380 km) wide. That's about half the width of the United States, or 2/3 the width of Earth's moon.

Pluto orbits the Sun about 3.6 billion miles (5.8 billion km) away on average, about 40 times as far as Earth, in a region called the Kuiper Belt.

A year on Pluto is 248 Earth years. A day on Pluto lasts 153 hours, or about 6 Earth days.

Pluto is officially classified as a dwarf planet.

Pluto has a thin atmosphere of nitrogen, methane and carbon monoxide. The atmosphere has a blue tint and distinct layers of haze.

Pluto has 5 moons. The largest, Charon, is so big that Pluto and Charon orbit each other like a double planet.

Pluto has no ring system.

The only spacecraft to visit Pluto is NASA’s New Horizons, which passed close by in July 2015.

Pluto’s surface is far too cold, -378 to -396 degrees F (-228 to -238 C), to sustain life as we know it.

Venetia Burney, just 11 years old at the time, suggested the name Pluto in 1930.