Europa's 'Spider' Mark Mystery Solved: Subsurface Ocean Points to Life.

• A "spider-like" mark, named "Damhán Alla" (Wall Demon), was observed on Jupiter's icy moon Europa by NASA's Galileo spacecraft in the late 1990s.
• Scientists suggest the mark formed from internal activity, not an impact, similar to "Lake Stars" on Earth's frozen lakes.
• The theory proposes that salty water (brine) erupts from beneath Europa's ice surface through cracks, creating the unique pattern as it freezes.
• The presence of liquid water beneath the surface significantly increases the potential for microbial life on Europa.
• NASA's Europa Clipper mission, arriving in 2030, will capture high-resolution images to confirm if Europa is an "ocean world" and if more such patterns exist.

Why It Matters: Europa's 'spider' mark suggests subsurface water, hinting at extraterrestrial life.