Columbia Encyclopedia

(Encyclopedia) Oberth, Hermann Julius, 1894–1989, Austro-German astronautical pioneer, b. Hermannstadt, Austria-Hungary (now Sibiu, Romania). Beginning his studies in astronautics before World War I, he first prop...

(Encyclopedia) astronautics: see space science. ...

(Encyclopedia) X-ray astronomy, study of celestial objects by means of the X rays they emit, in the wavelength range from 0.01 to 10 nanometers. X-ray astronomy dates to 1949 with the discovery that the sun emits X ...

(Encyclopedia) lunar exploration: see space exploration. ...

(Encyclopedia) Meteosat: see European Space Agency. ...

(Encyclopedia) Arianespace: see European Space Agency. ...

(Encyclopedia) McDonald Observatory, astronomical observatory located on Mt. Locke, near Fort Davis, Tex.; founded in 1932, sponsored by the Univ. of Texas in cooperation with the Univ. of Chicago. Its equipment inc...

(Encyclopedia) dwarf tree, in horticultural practice, a tree artificially kept to a smaller size than is normal for average members of the species. This is usually accomplished either by limiting its root space and ...

(Encyclopedia) NASA: see National Aeronautics and Space Administration. ...

(Encyclopedia) European Astronaut Center (EAC): see European Space Agency. ...