At least six moons in our solar system are thought to hide oceans of liquid water beneath their frozen surfaces — and the list may keep growing as old spacecraft data, improved models and new missions reveal oceans in increasingly unexpected places

The search for life beneath icy celestial surfaces faces new complications as researchers uncover evidence that Europa’s ice shell may be more resilient than previously estimated. While scientists have identified at least six moons in the solar system suspected of harboring liquid water oceans, the physical reality of accessing these environments is proving difficult. Recent observations suggest that ice cracks on Europa freeze shut within hours, creating a significant barrier that threatens to impede the planned objectives of the Clipper mission.

Data indicates that the ice shell serves as a much tougher obstacle for scientific exploration than planetary scientists initially projected. This new understanding forces a re-evaluation of how missions might effectively study the subsurface waters, as the window for investigating surface-level phenomena appears narrower than expected. Despite these physical challenges, the scope of the search for habitable environments continues to expand.

Space Daily notes that the list of moons containing potential oceans may keep growing as old spacecraft data and improved modeling techniques reveal water in increasingly unexpected places. Whether future missions can adapt to the rapid freezing of surface ice or if alternative methods for penetration will be required remains the primary open question for researchers.