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a Continuing Story of Discovery


Table of Contents

Overview of Europa Facts

Europa Quick-Look Statistics

Discovery:                             Jan 7, 1610 by Galileo Galilei
Diameter (km):                         3,138           
Mass (kg):                             4.8e22 kg 
Mass (Earth = 1)                       0.0083021
Surface Gravity (Earth = 1):           0.135 
Mean Distance from Jupiter (km):       670,900 
Mean Distance From Jupiter (Rj):       9.5 
Mean Distance from Sun (AU):           5.203
Orbital period (days):                 3.551181 
Rotational period  (days):             3.551181 
Density (gm/cm³)                       3.01 
Orbit Eccentricity:                    0.009
Orbit Inclination (degrees):           0.470
Orbit Speed (km/sec):                  13.74
Escape velocity (km/sec):              2.02 
Visual Albedo:                         0.64
Surface Composition:                   Water Ice

A Summary of Facts about Europa

Latest Europa Science Findings

General / Overview:

Possible Ocean:


Frequently Asked Questions about Europa

Europa Images

Missions Exploring Europa

Educational Activities and Resources

The Mythology of Jupiter and it's Satellites

The planets and moons in our solar system are all named for characters in Greek and Roman mythology. Here are some stories and artwork about the namesakes of Jupiter and the Galilean satellites.

USGS Europa Nomenclature page

The Discovery of the Galilean Satellites

Find out how Galileo Galilei discovered the moons around Jupiter.

Frequently asked Questions (FAQs)

  • Europa specific FAQ's
  • General Galileo FAQ's
  • Online From Jupiter FAQ (April 6, 1997)


    Links to Related Sites


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