Marine current power the rotation of the earth. The sun acts as the primary driving force, causing winds and temperature differences. Because there are only small fluctuations in current speed and stream location with minimal changes in direction, ocean currents may be suitable locations for deploying energy extraction devices such as turbines. Other effects such as regional differences in temperature and salinity and the Coriolis effect due to the rotation of the earth are also major influences. The kinetic energy of marine currents can be converted in much the same way that a wind turbine extracts energy from the wind, using various types
The Currents of Space is a form of cellulose. The possible destruction of Florina is predicted by Rik, a "spatio-analyst," who has had his mind manipulated by a "psychic probe" device, resulting in gross amnesia. When Rik gradually starts remembering his past, it produces a political crisis involving Sark, Florina, and Trantor. Rik, a native of the Earth, had discovered that Florina's sun is about to explode into a nova because it is being fed carbon by one of the outer-space "currents of space," supposedly rather like the currents of the ocean. It is also revealed finally that the special energetic wavelength of light