Changes

== Physical characteristics ==

== Physical characteristics ==

Uranus is a [[gas giant]] having a radius of 25,559 km (15,882 miles). Uranus’s atmosphere is about 83 % [[hydrogen]], 15% [[helium]], and 2% [[methane]]. The methane, more than any other constituent, gives Uranus its color.<ref name=rst/>

Uranus is a [[gas giant]] having a radius of 25,559&nbsp;km (15,882 miles). Uranus’s atmosphere is about 83% [[hydrogen]], 15% [[helium]], and 2% [[methane]]. The methane, more than any other constituent, gives Uranus its color.<ref name=rst/>

=== Atmosphere ===

=== Atmosphere ===

=== The magnetic field ===

=== The magnetic field ===

The strength of Uranus' magnetic field presented a problem when Voyager 2 flew by the planet in 1986. According to the classic dynamo theory, Uranus should not have an appreciable magnetic dipole moment. That it has, did not surprise creationists, because Dr. Russell Humphreys predicted its strength from his own model of the creation of celestial magnetic fields. Humphreys published his model two years before Voyager reconnoitered Uranus.<ref name=Humphreys/><ref name=Humphreys2/>

The strength of Uranus' magnetic field presented a problem when Voyager 2 flew by the planet in 1986. According to the classic dynamo theory, Uranus should not have an appreciable magnetic dipole moment. That it has, did not surprise creationists, because Dr. Russell Humphreys predicted its strength from his own model of the creation of celestial magnetic fields. Humphreys published his model two years before Voyager reconnoitered Uranus.<ref name=Humphreys2/><ref name=Humphreys/>

As mentioned, Uranus' magnetic axis is 60 degrees displaced from Uranus' axis of rotation. It is also displaced from the planet's center by about one-third of the planet's radius. The dynamo theory cannot account for such vast discrepancies. Humphreys' model says nothing about the alignment of a body's magnetic axis with respect to its rotational axis, so these findings do not compromise this model. Humphreys suggests that the displacement results from the asymmetric accretion of additional matter into Uranus' core after the planet's creation. The dynamo theory would have difficulty with this concept, because a dynamo requires a liquid core.<ref name=Humphreys2/>

As mentioned, Uranus' magnetic axis is 60 degrees displaced from Uranus' axis of rotation. It is also displaced from the planet's center by about one-third of the planet's radius. The dynamo theory cannot account for such vast discrepancies. Humphreys' model says nothing about the alignment of a body's magnetic axis with respect to its rotational axis, so these findings do not compromise this model. Humphreys suggests that the displacement results from the asymmetric accretion of additional matter into Uranus' core after the planet's creation. The dynamo theory would have difficulty with this concept, because a dynamo requires a liquid core.<ref name=Humphreys2/>