Uranus and Neptune are the smallest and outermost of the 4 Jovian

planets. While superficially similar to Jupiter and Saturn, there are

substantial differences. Uranus and Neptune have smaller rocky cores

surrounded by deep, slushy ice mantles and relatively thinner hydrogen

atmospheres, quite different from the massive cores and deep metallic

hydrogen mantles of Jupiter and Saturn. We will also ask why they

appear blue, look at their internal energy and weather, and then review

the properties of the Jovian planets as a group. Recorded 2006 Nov 16

in 100 Stillman Hall on the Columbus campus of The Ohio State

University.