We wanted to find out the average cost to replace a roof in the UK so we assume the following when we contacted our chosen companies: 1  A detached house with a simple âup and overâ roof design. 2  Approximately 64 square metres.e wanted to find out the average cost to replace a roof in the UK so we assume the following when we contacted our chosen companies: 1  A detached house with a simple âup and overâ roof design. 2  Approximately 64 square metres.
Jovian Planet Characteristics. Jupiter, Saturn, Uranus and Neptune are the four jovian planets of the solar system. The density of these planets is less than that of the earth, as they are mainly formed of hydrogen along with helium and compounds of hydrogen such as methane and ammonia. The mass of these planets is more than 10 times that of the Earth. 2  They have very small cores as compared to the terrestrial planets. 3  Gas storms are a common phenomena on the surface of the jovian planets.
Even though, the Jovian and terrestrial planets differ in structure, all of them have a solid core. But relative to the overall size of each planet, the cores of the terrestrial planets are larger than the cores of the Jovian planets.lanets in both groups have a gaseous atmosphere, but it is very thin in the case of terrestrial planets. All planets are capable of exerting gravtiational force, but the Jovian planets have larger gravitational fields, which help them hold on to their large gaseous atmospheres and numerous moons.