A drawing of a spacecraft and a partial view of Pluto with Charon in the distance
An artist's drawing shows the New Horizons spacecraft as it nears Pluto. The moon Charon is in the distance.
Credits: NASA
What Is Pluto Like?
Pluto is very, very cold. It is much colder than Antarctica. It is so cold that Earth’s air would freeze into a kind of snow there.
Pluto has less gravity than Earth. This means a person would weigh much less on Pluto than on Earth.
How Is NASA Exploring Pluto Today?
NASA learns about Pluto from pictures taken with telescopes. Pictures from the Hubble Space Telescope helped scientists find the four smaller moons. The Hubble telescope is very powerful. But Pluto is so far away that even pictures taken by Hubble are fuzzy.
NASA decided to send a spacecraft to fly close to Pluto. The spacecraft’s name is New Horizons. It is only about the size of a piano. New Horizons launched in January 2006. In summer 2015, New Horizons flew by Pluto and its moons. It took almost 10 years to travel that far from Earth!
New Horizons has cameras that took pictures of Pluto. As the spacecraft flew by, the science tools on board gathered information.
The pictures and information are helping scientists learn more about the dwarf planet. Scientists found that Pluto is two-thirds (2/3) rock and one-third (1/3) ice.
Scientists found out more about Pluto’s smaller moons too. They learned that Pluto's moons spin faster than other moons. The moon Hydra spins 89 times for each time it orbits Pluto! And the moons wobble like spinning tops!
New Horizons is studying more of the Kuiper Belt now that the spacecraft has finished its mission studying Pluto.