Apr 27 1961
From The Space Library
Javelin launched 70.6-pound payload to an altitude of 475 miles in beginning of Goddard Space Flight Center program to measure the density of electrons in the ionosphere.
Explorer XI, a gamma-ray satellite, was successfully launched into orbit by NASA Juno II from Cape Canaveral.
NASA Ames Research Center measured the intensity of radiation from the hot gas over the nose of a model flying through the air at 42,300 feet per second. This speed was in excess of parabolic atmospheric entry speed and the data are significant in relation to development of lunar spacecraft. The speed, 11,100 feet per second higher than maximum air speed obtained previously, was achieved by firing the model from a light-gas gun into a highspeed jet of air flowing in the opposite direction from a shock-driven wind tunnel.
F. W. Reichelderfer, Chief of the U.S. Weather Bureau, testified before the House Appropriations Committee that getting the same information contained in the cloud structure photographs taken by the Tiros I weather satellite would have required thousands of weather ships over the Pacific. With Tiros I, he said, "for the first time man had a complete look at the weather over a large segment of the Earth's surface."
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