heptane. n. 1. (Elements & Compounds) an alkane existing in nine isomeric forms, esp the isomer with a straight chain of carbon atoms (n-heptane), which is found in petroleum and used as an anaesthetic. Formula: C7H16. [C19: from hepta- + -ane, so called because it has seven carbon atoms].
technically it's not any of those three... After the Apollo program in the late 1960's ended, the president of the United States, Richard Nixon declared in 1973 that the USA would build the Space Shuttle to continue space exploration in low earth orbit.
(3 min) tv-pg. On April 12, 1981, NASA launched the world's first reusable manned spacecraft. In the minutes before takeoff, Kennedy Space Center launch control communicates with astronauts John Young and Robert Crippen as they prepare to take Columbia on its first test flight into space and back.