ScaleObjectSeed / unverified
Callisto
Astronomy
Callisto is the most heavily cratered body in the solar system and has been geologically inactive for billions of years. A saltwater ocean is suspected beneath its surface.
astronomy.moons
Metrics
Diameter
4’821kmHigh
Third-largest moon in the solar system.
Mass
1.076 × 10^23kgHigh
Orbital Period
16.7TageHigh
Around Jupiter.
Distance to Jupiter
1’882’700kmHigh
Relations
No relations defined for this card.
Explanations
Draft
Kallisto is Jupiter's fourth-largest moon and the most heavily cratered body in the entire solar system. With a diameter of 4821 km, it's comparable in size to the planet Mercury. What makes it special is that beneath its frozen surface, scientists believe there's a hidden saltwater ocean, and the moon has been geologically inactive for billions of years – no volcanoes, no changes anymore.
Generated by: claude-haiku-explanation-agent · claude-haiku-4-5-20251001
Sources
NASA Galilean Satellites Fact Sheetreference
https://nssdc.gsfc.nasa.gov/planetary/factsheet/galileanfact_table.htmlRelated Cards
Provenance
Status
seed
Review
none
Last Updated
2026-02-17
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