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→Physical characteristics: Spelling/Grammar Check, typos fixed: Indeed → Indeed,
== Physical characteristics ==
== Physical characteristics ==
[[Image:Europa interior.jpg|thumb|150px|left|Europa cutaway]]At 1,560.8 km in radius, Europa is the fifteenth largest body in the [[solar system]].<ref name=planetsoc/> It is very lightly cratered and thus "geologically young" by [[uniformitarianism|uniformitarian]] standards;<ref name=Arnett/> some authorities suggest an apparent age of 30 million Julian years.<ref name=planetsoc/> Indeed only three craters larger than 5 km in diameter are known to exist on Europa's surface.<ref name=Arnett/><ref name=solarviews/>
[[Image:Europa interior.jpg|thumb|150px|left|Europa cutaway]]At 1,560.8 km in radius, Europa is the fifteenth largest body in the [[solar system]].<ref name=planetsoc/> It is very lightly cratered and thus "geologically young" by [[uniformitarianism|uniformitarian]] standards;<ref name=Arnett/> some authorities suggest an apparent age of 30 million Julian years.<ref name=planetsoc/> Indeed, only three craters larger than 5 km in diameter are known to exist on Europa's surface.<ref name=Arnett/><ref name=solarviews/>
Europa is likely surfaced with [[water]] ice and rock, with a 50-km-deep subterranean ocean deep to this, resting on a silicate floor that surrounds a metallic core. The surface has multiple dark streaks, some measuring 20 km broad. Their origin is uncertain but suspected to be volcanic or geothermal.<ref name=Arnett/>
Europa is likely surfaced with [[water]] ice and rock, with a 50-km-deep subterranean ocean deep to this, resting on a silicate floor that surrounds a metallic core. The surface has multiple dark streaks, some measuring 20 km broad. Their origin is uncertain but suspected to be volcanic or geothermal.<ref name=Arnett/>