The base of the jovial groove as the little group walked was a lilting, repeating riff on the kora, the 21-string harp-lute that a musician played with its base propped against his torso, plucking with his thumbs. â
The Vanguard team was still working on a test vehicle (TV-2) designed to test the first stage of the rocket when they learned of the launch of the world's first artificial satellite, Sputnik I, by the USSR on October 4, 1957. On December 2, the Department of Defense announced the imminent launch of TV-3.
On January 15, 2015, the New Horizons spacecraft began its approach phase to Pluto. On July 14, 2015, at 11:49 UTC, it flew 12,500 km (7,800 mi) above the surface of Pluto, making it the first spacecraft to explore the dwarf planet.