Europa is the smallest of the 4 large Galilean moons of planet Jupiter. Europa is the ice moon of jupiter, possessing a subsurface water ocean and cryogeysers. It has the smoothest surface of any body in the solar system and has a thin oxygen atmosphere. Europa, along with Callisto, Ganymede, and Io, were discovered by the Italian astronomer Galileo Galilei in 1610.

Europa 4K pan-zoom image

Pan, zoom, or go full-screen with this megapixel image of Europa.

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  Source image: NASA (Galileo)

Europa facts

Designation: Jupiter II
Magnitude: 5.3
Mass: 4.8 x 1022 kg
Radius: 1,569 km
Density: 3.01 gm/cm3
Distance from planet: 670,900 km
Rotational period: 3.55 days
Orbital period: 3.55 days
Orbital velocity: 13.74 km/sec
Eccentricity of orbit: 0.009
Inclination of orbit: 0.470 °
Albedo: 0.67
Atmosphere: trace O2
Temperature (mean): -223°C / -148°C

Europa surface features

A few notable surface features on Europa:

Chaos plains of Europa

Closeup of the Conarama Chaos region.

We now know that our universe is stranger, far more alive, than we had ever imagined. The crew of Europa One changed the fundamental context in which all of humanity understands itself.

- Dr. Samantha Unger, Europa Report