U.S. Aerospace.
Orbiting Solar Observatory: one of a series of scientific satellites, launched between 1962 and 1975, that studied the sun at ultraviolet, x-ray, and gamma-ray wavelengths.
U.S. Aerospace.
Orbiting Solar Observatory: one of a series of scientific satellites, launched between 1962 and 1975, that studied the sun at ultraviolet, x-ray, and gamma-ray wavelengths.
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012