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Europa's ocean sits under a thick ice shell. If this ocean covers the moon's solid core, does the shell rotate at a different speed? | Astronomy.com

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Europa's ocean sits under a thick ice shell. If this ocean covers the moon's solid core, does the shell rotate at a different speed?

FROM THE August 2015 ISSUE

Europa's ocean sits under a thick ice shell. If this ocean covers the moon's solid core, does the shell rotate at a different speed?

Olle Bernell, Stockholm

Published: Monday, June 29, 2015

RELATED TOPICS: SOLAR SYSTEM | EUROPA | JUPITER

Jupiter's moon Europa is the size of Earth's satellite but may hold as much water as our planet beneath its icy shell.

The short answer is, “Yes, we think it may.” And the physics is really interesting!

To the best of our knowledge, Europa has an ice shell of a few to as many as 12 miles (20 kilometers) in thickness, underneath which lies a global 60-mile-deep (100km) liquid water ocean.

Astronomy magazine subscribers can read the full answer for free. Just make sure you're registered with the website.