Mariner 10 radiation. The plasma experiment's goal was to study the ionized gases (plasma) of the solar wind, the temperature and density of its electrons, and how the planets affected the velocity of the plasma stream. The experiment contained two components, facing in opposite directions. The Scanning Electrostatic Analyzer was aimed toward the Sun, and could detect positive ions and electrons, which were separated by a set of three concentric hemispherical plates. The Scanning Electron Spectrometer was aimed away from the Sun, and detected only electrons, using just one hemispherical plate. The instruments could be rotated about 60 degrees to either side.
Sun Stream stud, where her record as a broodmare was disappointing. Sun Stream was a chestnut mare with a white blaze and white hind feet. She was bred, like both her parents by her owner Edward Stanley, 17th Earl of Derby, the seven-time British flat racing Champion Owner. She was sired by Hyperion, who won The Derby and the St Leger Stakes for Lord Derby in 1933 and went on to become an internationally significant sire: Sun Stream's successes enabled Hyperion to claim the fourth of his six sires' championships in 1945. Sun Stream's dam, Drift, won four races including the Atalanta