Saturn's hexagon change in season. These changes were observed by the Cassini spacecraft. One hypothesis, developed at Oxford University, is that the hexagon forms where there is a steep latitudinal gradient in the speed of the atmospheric winds in Saturn's atmosphere. Similar regular shapes were created in the laboratory when a circular tank of liquid was rotated at different speeds at its centre and periphery. The most common shape was six sided, but shapes with three to eight sides were also produced. The shapes form in an area of turbulent flow between the two different rotating fluid bodies with dissimilar speeds. A
A Plane Is Born packed programme sees major progress on the plane with the rudder assembly completed and the fuselage top on and finally bonded. Back at Staverton, Mark learns how to talk - important for a presenter but vital for a pilot as he masters the rudiments of radio communication. In another look at other kit-planes, we meet fellow Europa constructor Peter Kember who was the first ever to home-build a Europa Kit. - All Revved Up It's a red-letter day down at the workshop as the brand new engine arrives with Europa's Andy Draper. Mark takes on the delicate task of fitting