osl 2 was launched in 1965 and placed in orbit.bo the 10 experiments ard returned new information about the sun. this included measurements of the solar outlook in the near-ultraviolet x-ray and gamma ray region. osl2 will be reactivated at a later date when slick conditions have changed. osl 3 failed to orbit and was lost in the atlantic. the experiments lost will be duplicated in the fifth osl. they are in various stages of fabrication and test at the contractor plant. present knowledge of the sun has shown the need for a higher position, higher capacity spacecraft for the study of solar phenomena. last year, and engineering model of an advanced orbiting solar observatory was completed. the stabilization and guidance system is being built. some sensors are under testing laboratory -- under test in the laboratory. astronomy, the study of the universe, achieves new dimensions in the ability to put instruments above the earth's atmosphere. here, they may measure gamma rays, x-rays, ultraviolet, infrared, and radiowaves that will not