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The Saturn family of American rockets was developed by a team of former German rocket engineers and scientists led by Wernher von Braun to launch heavy...

Shenzhou 5 (Chinese: 神舟五号; pinyin: Shénzhōu Wǔ Hào, see § Etymology) was the first human spaceflight mission of the Chinese space program, launched on...

Galaxy 15 is an American telecommunications satellite which is owned by Intelsat. It was launched for and originally operated by PanAmSat, and was subsequently...

Vesta was a planned multiple-asteroid-flyby mission that the Soviet Union assessed in the 1980s. The Vesta mission would have consisted of two identical...

Orbit determination is the estimation of orbits of objects such as moons, planets, and spacecraft. One major application is to allow tracking newly observed...

Henri Jacques Chrétien (French pronunciation: [ɑ̃ʁi ʒak kʁetjɛ̃]; 1 February 1879, Paris – 6 February 1956, Washington, D.C.) was a French astronomer and...