| http://www.w3.org/ns/prov#value | - If the planet contained mostly hydrogen and helium ??? like Jupiter or Saturn ??? it would be much larger, and if it was made up of rock and iron like Earth, Mars and Venus, it would be much smaller.This water world can either be surrounded by a light envelope of hydrogen and helium, like Neptune and Uranus, or be entirely surrounded by water, like most of Jupiter???s satellites.
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