Callisto: Jupiter's ancient time capsule moon
Jupiter's moon Callisto, a cosmic time capsule, preserves billions of years of solar system history through its heavily cratered, geologically inactive surface.
Jupiter's moon Callisto, discovered by Galileo in 1610, is a cosmic time capsule. Its surface is heavily scarred by countless craters, a permanent record of relentless asteroid and comet impacts from billions of years ago. Unlike its active siblings, Callisto has remained geologically quiet, preserving these ancient scars, including the massive Valhalla basin, over 3,000 kilometers wide. This pristine record offers scientists a unique glimpse into the chaotic formation of our solar system and the materials that bombarded it during the Late Heavy Bombardment period.