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Planetary scientists suspect Jupiter's moon Europa contains an ocean at least twice the size of Earth's. The Europa Clipper probe " which is the length of a basketball court and the largest craft the agency has sent on a planetary mission " is slated to blast to this distant realm on Oct. 10.
Before the launch, NASA released a new detailed view of the moon's cracked surface, which shows why for decades researchers have been drawn to this tantalizing place.