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 Whole Shebang: A State-of-the-Universe(s) Report Doppler effect, that galaxies are moving away in proportion to their distances from earth, which is evident by the redshift caused by lower frequencies generated from their normal frequency radiation. These detectable wavelength frequencies are at other than those of visible light. He explains in detail the Hubble constant, the ratio of the speed of a galaxy to its distance from earth. Ferris speculates that there is at least one, if not several, Black Holes in the middle of our own Milky Way galaxy. Visible light is unable to reach our telescopes from the center of the galaxy, so higher