Imagine Earth Shrinking to the Size of Pluto Consider the astronomical and geological implications of a drastically smaller Earth.

Pluto is so far from Earth, and so small, that its size isn't precisely known. When forming their model, the researchers assumed that the diameter of Pluto is roughly 1,429 miles (2,300 kilometers).

What processes during the formation of Pluto's largest moon, Charon, potentially led to it having cryovolcanism, and even an ...

To help space enthusiasts conceptualize Pluto’s size, NASA created a graphic comparing Earth, Pluto and Charon, Pluto’s largest moon.

Pluto likely acquired large moon Charon in a “kiss and capture” collision billions of years ago. It may have created a subsurface ocean on the icy dwarf planet.

A researcher has used advanced models that indicate that the formation of Pluto and Charon may parallel that of the Earth-Moon system. Both systems include a moon that is a large fraction of the ...

Charon is large in size relative to Pluto, and is locked in a tight orbit with the dwarf planet. A new simulation suggests how it ended up there.

When did Pluto stop being a planet, and why? Pluto was always in a tough spot when it came to being a planet. Just 1,477 miles across, it's only one-fifth the diameter of Earth.

Pluto at Last Nine years after leaving Earth, New Horizons closes in on the last of the Original Nine planets, and whatever lies beyond.