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.
The Jovian atmosphere shows a wide range of active phenomena, including band instabilities, vortices (cyclones and anticyclones), storms and lightning. The vortices reveal themselves as large red, white or brown spots (ovals). The largest two spots are the Great Red Spot (GRS) and Oval BA, which is also red.