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Europa: Overview
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TColor image of the Jovian moon Europa was acquired by Voyager 2.
These images show the trailing hemisphere of Jupiter's moon Europa taken by the Galileo spacecraft at a distance of about 677,000 km. The left image shows Europa in approximately true color and the right image shows Europa in enhanced color to bring out details.

Europa is an icy world slightly smaller than Earth's moon. It is unique in the solar system, being thought to have a global ocean of water in contact with a rocky seafloor. If the ocean is proven to exist, Europa could be a promising place to look for life beyond Earth.

10 Need-To-Know Things About Europa:

  1. If the sun were as tall as a typical front door, Earth would be the size of a nickel and Europa would be the size of the dome on the back of the nickel.
  2. Europa is a moon that orbits the planet Jupiter. Jupiter is the fifth planet from the sun at a distance of about 778 million km (484 million miles) or 5.2 AU.
  3. One day on Europa (the time it takes for Europa to rotate or spin once) takes about 3.5 Earth days. The length of Europa's day is the same as the amount of time it takes Europa to orbit Jupiter. Jupiter makes a complete orbit around the sun (one Jupiter year) in about 12 Earth years (4,333 Earth days).
  4. Like many other moons (including Earth's moon), Europa is locked by gravity to its planet so that the same side always faces toward Jupiter.
  5. Europa's surface is mostly solid water ice. It is extremely smooth and crisscrossed by fractures.
  6. Europa has an extremely thin oxygen atmosphere -- far too thin to breathe.
  7. Europa does not have rings.
  8. Europa and Jupiter have been visited by eight spacecraft, which have performed flybys. Galileo is the only mission to make repeated visits to Europa.
  9. With abundant liquid water, and energy and chemistry provided by tidal heating, Europa could be the best place in the solar system to look for present day life beyond Earth.
  10. If Europa's ocean is proven to exist, it would possess more than twice as much water as Earth.

Read More About Europa Blue arrow

Just the Facts
Orbit Size (semi-major axis):  671,100 km
Mean Radius:  1,560.8 km
Volume:  15,926,867,918 km3
Mass:  47,998,438,387,492,700,000,000 kg
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Last Updated: 9 Oct 2014