"1989-12-28Z"^^ . . "German physicist" . "Hermann Julius Oberth"@en . . "Hermann Julius Oberth (25 June 1894 \u2013 28 December 1989) was an Austro-Hungarian-born German physicist and engineer. He is considered one of the founding fathers of rocketry and astronautics."@en . . "1894-06-25Z"^^ . "Oberth, Hermann"@en . "Hermann Oberth"@en . . . . . "1894Z"^^ . . "1989Z"^^ . . . . . . . .