... ELEMENTAL COMPOSITION OF MARTIAN ROCKS . ... determination of the abundance of natural radioactive elements ( K, U, Th ), basic rock-forming elements ( H, C, Mg, Al, Si, S, Cl, Ca, Ti, Fe). Method of measurements is based on recording gamma-rays from natural radionuclides in rocks and gamma-rays generated by nuclear interactions of cosmic rays with elements of Martian surface rocks. ... detection unit (BD-1) using a CsI crystal, with a bismuth germanate collimator. ... Energy range . ...

... Ranger 9 was designed to achieve a lunar impact trajectory and to transmit high-resolution photographs of the lunar surface during the final minutes of flight. The spacecraft carried six television cameras, an optical earth sensor and high-gain antenna for optimum communications, and solar panels to provide power, as well as additional engineering equipment. ... The spacecraft encountered the lunar surface with an incoming asymptotic direction at an angle of -5.6 degrees from the lunar equator. ...

... Astronomy of the Earth's motion in space. ... For easier reading, view this site with size 14 font (but print out with size 10 or 12 ). ... Stargazers" files are also available as a TARed and GZIPed file via anonymous FTP . ... Discovery of the Solar System . ... Kepler's First Law of Planetary Motion . ... 29a. Satellites observing the Sun, solar system and the universe . ... Orbits in Space . ... From Stargazers to Starships" follows an earlier site "The Exploration of the Earth's Magnetosphere" ....