Cassini Enceladus
An illustration of NASA's Cassini spacecraft flying through a plume above the surface of Saturn's moon Enceladus.

Discoveries involving two “ocean world” moons in the outer solar system announced April 13 are likely to bolster the case for planned and proposed spacecraft missions to those worlds.

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Jeff Foust has more than a decade of experience writing about space policy, entrepreneurial ventures and regulatory affairs. In 2001, he established spacetoday.net to aggregate and summarize the day's space-related news stories. In 2003, he started The...