Due to Pluto’s distance from Earth, the planet’s surface hasn’t been studied much. It’s believed to be 98% solid nitrogen with traces of methane and carbon monoxide. Surface temperatures range from −382°F (-230°C) to −346°F (-210°C).

Pluto’s orbital period is 248 years, and its day is equal to almost 7 Earth days, approximately 6.387 days. Pluto’s mass is small — only 0.22% that of Earth. Its diameter is 1,476.8 miles, which is almost 5 and a half times smaller than that of Earth (the diameter of Earth is 7,918 miles). Despite all of this, Pluto is the largest Kuiper belt object beyond the orbit of Neptune.

Pluto has 5 moons. The largest and closest of them is Charon, which rotates synchronously with the planet. The rest of the moons, Styx, Nix, Kerberos, and Hydra, revolve around Pluto at their own pace.

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