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.
The balance of the space program, all manned by a crew of 3 astronauts, was as follows: 1  Apollo 7 â October 11 to 12, 1968. Flight designed to test the entire spacecraft in earth orbit.  Apollo 8 â December 21 to 27, 1968. The first mission to orbit the moon.