Answer to Question 1
Uranus never grew massive enough to capture large amounts of gas from the solar nebula as Jupiter and Saturn did, so it has much less hydrogen and helium. Its internal pressure is enough lower than Jupiter's that it should not contain any liquid metallic hydrogen. Models of Uranus based in part on its density and oblateness suggest that it has a small core of heavy elements and a deep mantle of partly solid water. Although referred to as ice, this material would not be anything like ice on Earth, given the temperatures and pressures inside Uranus. The mantle also contains rocky-composition material and dissolved ammonia and methane. Circulation in this electrically conducting mantle may generate the planet's peculiar magnetic field, which is highly inclined to its axis of rotation. Above this mantle lies a deep hydrogen and helium atmosphere.
Answer to Question 2
Models indicate that the interior of Jupiter is mostly liquid hydrogen. Under very high pressure, liquid hydrogen becomes liquid metallic hydrogen-a material that is a very good conductor of electricity. Most of Jupiter's interior is composed of this material. That large mass of conducting liquid, stirred by convection currents and spun by the planet's rapid rotation, drives the dynamo effect and generates a powerful magnetic field. Jupiter's field is more than 10 times stronger than Earth's. A planet's magnetic field deflects the solar wind and dominates a volume of space around the planet called the magnetosphere.
Replica of the telescope used by Herschel to discover Uranus
Zonal wind speeds on Uranus. Shaded areas show the southern collar and its future northern counterpa
Major moons of Uranus in order of increasing distance (left to right), at their proper relative size
Field research on free-living primates allows primatologists to study patterns of behavior in the se
Dropping a Sterile Item onto a Sterile Field
In a Millikan experiment, a 6.89E-14 kg charged oil droplet is suspended in the electric field ...