Changes

Jupiter's sidereal day is less than ten Earth hours long. If Jupiter formed simply as an accretion aggregate of the [[nebula hypothesis|solar nebula]], then it should not have acquired such tremendous angular momentum. The problem involves not merely the short sidereal day but also Jupiter's tremendous mass.

Jupiter's sidereal day is less than ten Earth hours long. If Jupiter formed simply as an accretion aggregate of the [[nebula hypothesis|solar nebula]], then it should not have acquired such tremendous angular momentum. The problem involves not merely the short sidereal day but also Jupiter's tremendous mass.

The alternative theory is that Jupiter formed as a "failed protostar" at the center of its own nebula. But Jupiter never ignited--and furthermore, none of Jupiter's 63 moons is gaseous. Therefore a key event in the nebular sequence did not take place. Besides, the four dwarf-planet-sized [[Galilean moons]] have vastly differing apparent geological "ages."

The alternative theory is that Jupiter formed as a "failed protostar" at the center of its own nebula. But Jupiter never ignited--and furthermore, none of Jupiter's 63 moons is gaseous. Therefore a key event in the nebular sequence did not take place. Besides, the four dwarf-planet-sized [[Galilean moons]] have vastly differing apparent geological "ages," coming from times estimated to be as disparate as ten million years to as recent as thirteen hundred (although the times cannot be fixed with any reliability).<ref>Fulbright, Jeannie. ''Exploring Creation with Astronomy.'' Apologia Educational Ministries, 2004.</ref>

== Exploration ==

== Exploration ==